Core/Misc: Use proper headers to optimize compile

src/server/scripts/Examples/example_spell.cpp

@@ -22,9 +22,10 @@
  * and `ScriptName` is the name of a script assigned on registration
  */
 
-#include "ScriptPCH.h"
+#include "ScriptMgr.h"
 #include "SpellAuras.h"
 #include "SpellAuraEffects.h"
+#include "SpellScript.h"
 
 enum Spells
 {