Core: Get rid of dirty operator workaround for ACE_Singleton class implementation

--HG--
branch : trunk

src/server/game/Weather/Weather.cpp

@@ -61,7 +61,7 @@ bool Weather::Update(uint32 diff)
         }
     }
 
-    sScriptMgr.OnWeatherUpdate(this, diff);
+    sScriptMgr->OnWeatherUpdate(this, diff);
     return true;
 }
 
@@ -268,7 +268,7 @@ bool Weather::UpdateWeather()
     }
     sLog.outDetail("Change the weather of zone %u to %s.", m_zone, wthstr);
 
-    sScriptMgr.OnWeatherChange(this, state, m_grade);
+    sScriptMgr->OnWeatherChange(this, state, m_grade);
     return true;
 }