[foolfuuka] simplify

- filter posts manually
- don't use lists for 'in' checks against constant values

gallery_dl/extractor/foolfuuka.py

@@ -32,9 +32,10 @@ class FoolfuukaExtractor(BaseExtractor):
 
     def items(self):
         yield Message.Directory, "", self.metadata()
-        for post in filter(lambda p: p.get("media"), self.posts()):
+        for post in self.posts():
+            if not (media := post.get("media")):
+                continue
             board = post["board"]["shortname"]
-            media = post["media"]
             url = media["media_link"]
 
             if not url and "remote_media_link" in media:
@@ -57,7 +58,7 @@ class FoolfuukaExtractor(BaseExtractor):
 
     def remote(self, board, media):
         """Resolve a remote media link"""
-        if board in ["wsg", "gif"]:
+        if board in {"wsg", "gif"}:
             return f"https://i.4cdn.org/{board}/{media['media_orig']}"
         page = self.request(media["remote_media_link"]).text
         url = text.extr(page, 'http-equiv="Refresh" content="0; url=', '"')