Adjusted instance script's instance_enter to new format

* Follow up to c97be60.
* No longer requires instance name.

npc/instances/EndlessTower.txt

@@ -291,7 +291,7 @@ e_tower,81,105,0	script	Tower Protection Stone	406,{
 	}
 
 L_Enter:
-	switch(instance_enter("Endless Tower")) {
+	switch(instance_enter()) {
 	case 3:
 		mes "An unknown error has occurred.";
 		close;

npc/instances/NydhoggsNest.txt

@@ -192,7 +192,7 @@ nyd_dun02,100,201,3	script	Yggdrasil Gatekeeper	111,8,8,{
 	close;
 
 L_Enter:
-	switch(instance_enter("Nidhoggur's Nest")) {
+	switch(instance_enter()) {
 	case 3:
 		mes "[Yggdrasil Gatekeeper]";
 		mes "An unknown error has occurred.";

npc/instances/OrcsMemory.txt

@@ -84,7 +84,7 @@ gef_fild10,242,202,0	script	Dimensional Gorge Piece	406,{
 	mes "In order to generate a dungeon you must be the Party Leader and have at least 2 members in the party.";
 	close;
 L_Enter:
-	switch(instance_enter("Orc's Memory")) {
+	switch(instance_enter()) {
 	case 3:
 		mes "An unknown error has occurred.";
 		close;

npc/instances/SealedShrine.txt

@@ -214,7 +214,7 @@ monk_test,306,151,3	script	Grave of Baphomet#edq	111,{
 	//set .@ins_bapho_check2,checkquest(3045,PLAYTIME);
 
 	if (.@ins_bapho_check == -1) {
-		switch(instance_enter("Sealed Catacomb")) {
+		switch(instance_enter()) {
 		case 3:
 		case 2:
 			mes "It's cold to the touch. It doesn't respond.";

npc/re/instances/BakonawaLake.txt

@@ -74,7 +74,7 @@ ma_scene01,174,179,4	script	Taho	541,{
 			mes "Now I'm weaving, so you can go down when I'm done.";
 			close;
 		case 2:
-			switch(instance_enter(.@md_name$)) {
+			switch(instance_enter()) {
 			case 3:
 				mes "[Taho]";
 				mes "An unknown error occurred.";

npc/re/instances/BangungotHospital.txt

@@ -282,7 +282,7 @@ L_Enter:
 		cutin "",255;
 		end;
 	case 2:
-		switch(instance_enter(.@md_name$)) {
+		switch(instance_enter()) {
 		case 3:
 			mes "[Nurse Maenne]";
 			mes "A critical situation has happened.";

npc/re/instances/BuwayaCave.txt

@@ -126,7 +126,7 @@ OnTouch:
 	}
 	switch(select("Enter.:Turn back.")) {
 	case 1:
-		switch(instance_enter("Buwaya Cave")) {
+		switch(instance_enter()) {
 		case 3:
 			mes "[Guard]";
 			mes "Oh, now is not a good time.";

npc/re/instances/EclageInterior.txt

@@ -74,7 +74,7 @@ ecl_hub01,130,15,0	script	It is closed shut.	844,{
 				mes "It is pretty difficult to guide an outsider like you.";
 				close;
 			}
-			switch (instance_enter(.@md_name$)) {
+			switch (instance_enter()) {
 			case 3:
 				mes "An unknown error has occurred.";
 				close;

npc/re/instances/HazyForest.txt

@@ -139,7 +139,7 @@ bif_fild01,161,355,0	script	Log Tunnel	844,{
 	next;
 	if(select("Enter the tunnel.:Give up.") == 2)
 		close;
-	switch(instance_enter("Mistwood Maze")) {
+	switch(instance_enter()) {
 	case 3:
 		mes "[Laphine Soldier]";
 		mes "Something doesn't feel right. Looks like something dangerous is going on, so you'd better turn back today.";

npc/re/instances/MalangdoCulvert.txt

@@ -432,7 +432,7 @@ mal_in01,160,34,4	script	Missing, the Cleaner	545,{
 	}
 	end;
 L_Enter:
-	switch(instance_enter("Culvert")) {
+	switch(instance_enter()) {
 	case 3:
 		mes "An unknown error has occurred.";
 		close;

npc/re/instances/OctopusCave.txt

@@ -119,7 +119,7 @@ mal_dun01,153,237,5	script	Weird Entrance	844,{
 	switch(select("Go in.:Stop.")) {
 	case 1:
 		if (countitem(6442)) {
-			switch(instance_enter("Octopus Cave")) {
+			switch(instance_enter()) {
 			case 3:
 				mes "[Starfish]";
 				mes "Ah, now is not the time...";

npc/re/instances/OldGlastHeim.txt

@@ -51,7 +51,7 @@ glast_01,204,273,6	script	Hugin#ghinstance	755,{
 			mes "The time gap was created. When you're ready, talk to me again.";
 			close;
 		case 2:
-			switch(instance_enter(.@md_name$)) {
+			switch(instance_enter()) {
 			case 3:
 				mes "An unknown error has occurred.";
 				close;

npc/re/instances/WolfchevLaboratory.txt

@@ -877,7 +877,7 @@ lhz_dun04,147,279,0	script	Laboratory Entrance#memo	CLEAR_NPC,{
 			mes "You have stopped entering to Wolfchev's laboratory.";
 			close;
 		}
-		if (instance_enter("Wolfchev's Laboratory") != 0) {  // probably missing failure cases
+		if (instance_enter() != 0) {  // probably missing failure cases
 			mes "^FF0000Warning^000000";
 			mes ""+ strcharinfo(0) +". . .";
 			mes "^FF0000Unregistered personnel^000000";