Core: Removed more operator workarounds for ACE_Singleton (missed previously because of inconsistent naming)

--HG--
branch : trunk

src/server/game/Chat/Channels/ChannelMgr.cpp

@@ -22,7 +22,7 @@
 
 ChannelMgr* channelMgr(uint32 team)
 {
-    if (sWorld.getBoolConfig(CONFIG_ALLOW_TWO_SIDE_INTERACTION_CHANNEL))
+    if (sWorld->getBoolConfig(CONFIG_ALLOW_TWO_SIDE_INTERACTION_CHANNEL))
         return ACE_Singleton<AllianceChannelMgr, ACE_Null_Mutex>::instance();        // cross-faction
 
     if (team == ALLIANCE)