Core/Misc: remove unused function prototype

(cherry picked from commit 2efd40b804)

src/common/Collision/Management/MMapFactory.h

@@ -43,7 +43,6 @@ namespace MMAP
         public:
             static MMapManager* createOrGetMMapManager();
             static void clear();
-            static bool IsPathfindingEnabled(uint32 mapId);
     };
 }