[cleanup] Use format_field where applicable

yt_dlp/extractor/flickr.py

@@ -7,6 +7,7 @@ from ..compat import (
 )
 from ..utils import (
     ExtractorError,
+    format_field,
     int_or_none,
     qualities,
 )
@@ -95,7 +96,7 @@ class FlickrIE(InfoExtractor):
             owner = video_info.get('owner', {})
             uploader_id = owner.get('nsid')
             uploader_path = owner.get('path_alias') or uploader_id
-            uploader_url = 'https://www.flickr.com/photos/%s/' % uploader_path if uploader_path else None
+            uploader_url = format_field(uploader_path, template='https://www.flickr.com/photos/%s/')
 
             return {
                 'id': video_id,