fix a logging error in thumbnailer (#8435)

Introduced in #8236

changelog.d/8435.bugfix

+Fix a longstanding bug where files that could not be thumbnailed would result in an Internal Server Error.

synapse/rest/media/v1/media_repository.py

@@ -637,7 +637,7 @@ class MediaRepository:
             thumbnailer = Thumbnailer(input_path)
         except ThumbnailError as e:
             logger.warning(
-                "Unable to generate thumbnails for remote media %s from %s using a method of %s and type of %s: %s",
+                "Unable to generate thumbnails for remote media %s from %s of type %s: %s",
                 media_id,
                 server_name,
                 media_type,