Core/Misc: Use proper headers to optimize compile

src/server/game/AI/SmartScripts/SmartAI.cpp

@@ -27,9 +27,8 @@
 #include "InstanceScript.h"
 #include "ScriptedCreature.h"
 #include "Group.h"
-
 #include "SmartAI.h"
-#include "ScriptPCH.h"
+#include "ScriptMgr.h"
 
 SmartAI::SmartAI(Creature* c) : CreatureAI(c)
 {