Fixed custom OGGs not being played with playef()

When OGG files got loaded, they weren't given a name in the
function LoadOGG(). This caused playef_name() to fail since
it couldn't match any of the custom pushed OGGs' filenames
with what the user called using playef. This was fixed by
copying the name definition from LoadWAV().

desktop_version/src/Music.cpp

@@ -171,6 +171,7 @@ end:
 
         ogg_file = mem;
         valid = true;
+        name = std::string(SDL_strrchr(fileName, '/') + 1);
     }
 
     void Dispose(void)