Core: Remove "enumeration value 'xxx' not handled in switch" warnings

--HG--
branch : trunk

src/server/game/AI/ScriptedAI/ScriptedCreature.cpp

@@ -599,6 +599,8 @@ bool BossAI::CheckBoundary(Unit *who)
                 if (me->GetPositionX() - me->GetPositionY() < itr->second)
                     return false;
                 break;
+            default:
+                break;
         }
     }