Core/Misc: Use proper headers to optimize compile

src/server/game/Scripting/ScriptSystem.cpp

@@ -16,10 +16,10 @@
  * with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "ScriptPCH.h"
 #include "ScriptSystem.h"
 #include "ObjectMgr.h"
 #include "DatabaseEnv.h"
+#include "ScriptMgr.h"
 
 ScriptPointVector const SystemMgr::_empty;