remove @staticmethod decorators

There might have been a time when calling a static method was faster
than a regular method, but that is no longer the case. According to
micro-benchmarks, it is 70% slower in CPython 3.13 and it also makes
executing the code of a class definition slower.

gallery_dl/extractor/foolfuuka.py

@@ -74,8 +74,7 @@ class FoolfuukaExtractor(BaseExtractor):
 
         return url
 
-    @staticmethod
-    def _remote_direct(media):
+    def _remote_direct(self, media):
         return media["remote_media_link"]