[instagram] rename to 'liked', enable for GraphQL results

gallery_dl/extractor/instagram.py

@@ -168,7 +168,7 @@ class InstagramExtractor(Extractor):
                 "likes": post.get("like_count", 0),
                 "pinned": post.get("timeline_pinned_user_ids", ()),
                 "date": text.parse_timestamp(post.get("taken_at")),
-                "user_has_liked": post.get('has_liked', False),
+                "liked": post.get("has_liked", False),
             }
 
             caption = post["caption"]
@@ -271,6 +271,7 @@ class InstagramExtractor(Extractor):
             "typename"   : typename,
             "date"       : text.parse_timestamp(post["taken_at_timestamp"]),
             "likes"      : post["edge_media_preview_like"]["count"],
+            "liked"      : post.get("viewer_has_liked", False),
             "pinned"     : pinned,
             "owner_id"   : owner["id"],
             "username"   : owner.get("username"),