Fix default hook signature

Since the hook function can be both bound and unbound
the bound signature needs to accept an extra argument

discord/gateway.py

@@ -717,7 +717,7 @@ class DiscordVoiceWebSocket:
         if hook:
             self._hook = hook
 
-    async def _hook(self, msg):
+    async def _hook(self, *args):
         pass
     
     async def send_as_json(self, data):