Fixed file save regression in privacy plugin (#7673)

Author: nejch

src/plugins/privacy/plugin.py

@@ -467,7 +467,7 @@ def _patch(self, initiator: File):
 
             # Replace callback
             def replace(match: Match):
-                value = match.group(1)
+                value = match.group("url")
 
                 # Map URL to canonical path
                 path = self._path_from_url(urlparse(value))