NPC_KEEPING no longer remains on monster after its class is changed, bugreport:3469

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@15124 54d463be-8e91-2dee-dedb-b68131a5f0ec

src/map/mob.c

@@ -2625,7 +2625,7 @@ int mob_class_change (struct mob_data *md, int class_)
 
 	//Need to update name display.
 	clif_charnameack(0, &md->bl);
-
+	status_change_end(&md->bl,SC_KEEPING,INVALID_TIMER);
 	return 0;
 }