harvester.py: cache_folder should be a pathlib.Path.

ref: 74c26ab

Author: mtwebster

python3/cinnamon/harvester.py

@@ -125,7 +125,7 @@ def __init__(self, spice_type, uuid, index_node, meta_node):
 
 class SpicePathSet():
     def __init__(self, cache_item, spice_type):
-        cache_folder = os.path.join(GLib.get_user_cache_dir(), 'cinnamon', 'spices', spice_type)
+        cache_folder = Path(os.path.join(GLib.get_user_cache_dir(), 'cinnamon', 'spices', spice_type))
 
         is_theme = spice_type == "theme"