Remove unnecessary token_for from ChannelPointsReward.fetch_reward (#510)

Author: bartmoorman

twitchio/models/eventsub_.py

@@ -3603,7 +3603,7 @@ def get_image(self, size: Literal["1x", "2x", "4x"] = "2x", use_default: bool =
 
         return Asset(url, http=self._http)
 
-    async def fetch_reward(self, *, token_for: str) -> CustomReward:
+    async def fetch_reward(self) -> CustomReward:
         reward = await self.broadcaster.fetch_custom_rewards(ids=[self.id])
         return reward[0]