[instagram] Improve thumbnail extraction

youtube_dl/extractor/instagram.py

@@ -156,7 +156,7 @@ class InstagramIE(InfoExtractor):
             description = try_get(
                 media, lambda x: x['edge_media_to_caption']['edges'][0]['node']['text'],
                 compat_str) or media.get('caption')
-            thumbnail = media.get('display_src')
+            thumbnail = media.get('display_src') or media.get('display_url')
             timestamp = int_or_none(media.get('taken_at_timestamp') or media.get('date'))
             uploader = media.get('owner', {}).get('full_name')
             uploader_id = media.get('owner', {}).get('username')