Scripts: fix area trigger scripts. Thanks yavi. Closes issue #3634

--HG--
branch : trunk

src/server/game/Scripting/ScriptMgr.cpp

@@ -855,7 +855,7 @@ bool ScriptMgr::OnAreaTrigger(Player* player, AreaTriggerEntry const* trigger)
     ASSERT(player);
     ASSERT(trigger);
 
-    GET_SCRIPT_RET(AreaTriggerScript, trigger->id, tmpscript, false);
+    GET_SCRIPT_RET(AreaTriggerScript, GetAreaTriggerScriptId(trigger->id), tmpscript, false);
     return tmpscript->OnTrigger(player, trigger);
 }