Negative npc input checks for arena_points.

* Related issue: #2557
* Thanks to @mazvi

npc/other/arena/arena_point.txt

@@ -62,7 +62,7 @@ prt_are_in,103,11,3	script	Arena Point Manager	732,{
 			mes "To cancel, enter ''^3355FF0^000000.''";
 			next;
 			input .@input;
-			if (.@input == 0) {
+			if (.@input <= 0) {
 				mes "[Arena Point Manager]";
 				mes "You have";
 				mes "canceled";
@@ -113,8 +113,8 @@ prt_are_in,103,11,3	script	Arena Point Manager	732,{
 					mes "into 5 Arena Points " + .@input + " times.";
 					mes "A total of " + .@want_point1 + " Turbo Track Points were converted into";
 					mes "" + .@want_point +" Arena Points.";
-					set tt_point,tt_point - .@want_point1;
-					set arena_point,arena_point+.@want_point;
+					set tt_point, .@my_turbo_all;
+					set arena_point, .@my_arena_all;
 					next;
 					mes "[Arena Point Manager]";
 					mes "" + strcharinfo(0) + ",";

npc/other/arena/arena_room.txt

@@ -999,7 +999,7 @@ function	script	Func_Are_Rew	{
 	mes "If you wish to cancel, please enter 0. If you don't, please enter how many ^3131FFtimes^000000 of arena points you wish to spend.";
 	next;
 	input .@reward;
-	if (.@reward == 0) {
+	if (.@reward <= 0) {
 		mes "[Givu]";
 		mes "You have canceled your request.";
 		close;
@@ -1008,7 +1008,7 @@ function	script	Func_Are_Rew	{
 		mes "You have exceeded the maximum capacity.";
 		close;
 	}
-	if (arena_point < .@reward * .@arena_point) {
+	if (arena_point < (.@reward * .@arena_point)) {
 		mes "[Givu]";
 		mes "You do not have enough arena points.";
 		mes "Please check the total amount of arena points you have.";

npc/other/turbo_track.txt

@@ -4492,7 +4492,7 @@ turbo_room,106,117,3	script	Point Manager#tt	833,{
 			mes "is 20. To cancel, enter '^3355FF0^000000.'";
 			next;
 			input .@input;
-			if (.@input == 0) {
+			if (.@input <= 0) {
 				mes "[Turbo Track Point Manager]";
 				mes "You have";
 				mes "canceled";