gpodder.util: Fix a bug in delete_empty_folders

The bug could have caused an empty directory in the current working
directory to be removed if an empty folder of the same name exists in
the download directory.

src/gpodder/util.py

@@ -1763,5 +1763,5 @@ def delete_empty_folders(top):
         for name in dirs:
             dirname = os.path.join(root, name)
             if not os.listdir(dirname):
-                os.rmdir(name)
+                os.rmdir(dirname)