Corrects Spirit/Charm absorption behaviour on Ninja Spirit Charm (#2980)

* Fixes #2087.
* The conditional was missing a check on Kagero/Oboro's Spirit Charm, therefore not removing the charms nor applying SP regeneration on caster.
Thanks to @Chisee!

src/map/skill.cpp

@@ -6968,7 +6968,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, ui
 
 	case MO_ABSORBSPIRITS:
 		i = 0;
-		if (dstsd && dstsd->spiritball && (sd == dstsd || map_flag_vs(src->m) || (sd && sd->duel_group && sd->duel_group == dstsd->duel_group)) &&
+		if (dstsd && (sd == dstsd || map_flag_vs(src->m) || (sd && sd->duel_group && sd->duel_group == dstsd->duel_group)) &&
 			((dstsd->class_&MAPID_BASEMASK) != MAPID_GUNSLINGER || (dstsd->class_&MAPID_UPPERMASK) != MAPID_REBELLION)) { // split the if for readability, and included gunslingers in the check so that their coins cannot be removed [Reddozen]
 			if (dstsd->spiritball > 0) {
 				i = dstsd->spiritball * 7;
@@ -9961,7 +9961,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, ui
 	case SR_ASSIMILATEPOWER:
 		if (flag&1) {
 			i = 0;
-			if (dstsd && dstsd->spiritball && (sd == dstsd || map_flag_vs(src->m)) && (dstsd->class_&MAPID_BASEMASK)!=MAPID_GUNSLINGER) {
+			if (dstsd && (sd == dstsd || map_flag_vs(src->m)) && (dstsd->class_&MAPID_BASEMASK)!=MAPID_GUNSLINGER) {
 				if (dstsd->spiritball > 0) {
 					i = dstsd->spiritball;
 					pc_delspiritball(dstsd,dstsd->spiritball,0);