Core: dispatch scene events to PlayerScripts too

ScriptMgr::OnSceneTrigger/Cancel/Complete only called the bound SceneScript
(via scene_template.ScriptName). The Thordekk Exiles Reach ride (and other
scene-driven content) registers its handlers as PlayerScript hooks
(OnSceneTriggerEvent/OnSceneComplete/OnSceneCancel), so 'Trampling Time' and
'Big Kill Credit' never fired -> the Giant Boar trample never cast and the
cadaver kill credit never granted. Add the FOREACH_SCRIPT(PlayerScript)
dispatch to all three.

src/server/game/Scripting/ScriptMgr.cpp

@@ -2354,6 +2354,7 @@ void ScriptMgr::OnSceneTrigger(Player* player, uint32 sceneInstanceID, SceneTemp
     ASSERT(player);
     ASSERT(sceneTemplate);
 
+    FOREACH_SCRIPT(PlayerScript)->OnSceneTriggerEvent(player, sceneInstanceID, triggerName);
     GET_SCRIPT(SceneScript, sceneTemplate->ScriptId, tmpscript);
     tmpscript->OnSceneTriggerEvent(player, sceneInstanceID, sceneTemplate, triggerName);
 }
@@ -2363,6 +2364,7 @@ void ScriptMgr::OnSceneCancel(Player* player, uint32 sceneInstanceID, SceneTempl
     ASSERT(player);
     ASSERT(sceneTemplate);
 
+    FOREACH_SCRIPT(PlayerScript)->OnSceneCancel(player, sceneInstanceID);
     GET_SCRIPT(SceneScript, sceneTemplate->ScriptId, tmpscript);
     tmpscript->OnSceneCancel(player, sceneInstanceID, sceneTemplate);
 }
@@ -2372,6 +2374,7 @@ void ScriptMgr::OnSceneComplete(Player* player, uint32 sceneInstanceID, SceneTem
     ASSERT(player);
     ASSERT(sceneTemplate);
 
+    FOREACH_SCRIPT(PlayerScript)->OnSceneComplete(player, sceneInstanceID);
     GET_SCRIPT(SceneScript, sceneTemplate->ScriptId, tmpscript);
     tmpscript->OnSceneComplete(player, sceneInstanceID, sceneTemplate);
 }