Fix query to account for new column type.

The type of the file_data.data column was
changed from JSON to JSONB by commit
2d270cdef9.

Fixes #54.

bin/datastore.py

@@ -563,7 +563,7 @@ class Datastore:
 			INSERT INTO labels (name, data)
 			SELECT l.key, l.value
 			FROM file_data fd,
-			json_each(fd.data->'labels') l
+			jsonb_each(fd.data->'labels') l
 			WHERE fd.data::jsonb ? 'labels'
 			ON CONFLICT (name) DO UPDATE SET data = excluded.data;
 		"""