Core/Vmaps: Changed error message when loading outdated vmaps

Closes #18431
Closes #18857

src/common/Collision/Management/VMapManager2.cpp

@@ -324,7 +324,7 @@ namespace VMAP
         }
     }
 
-    bool VMapManager2::existsMap(const char* basePath, unsigned int mapId, int x, int y)
+    LoadResult VMapManager2::existsMap(const char* basePath, unsigned int mapId, int x, int y)
     {
         return StaticMapTree::CanLoadMap(std::string(basePath), mapId, x, y);
     }