Correct CustomReward.edit() parameter

Correct enabled to is_enabled

Author: chillymosh

docs/changelog.rst

@@ -16,6 +16,7 @@ Master
         - Made Chatter :attr:`~twitchio.Chatter.id` property public
         - :func:`~twitchio.Client.event_token_expired` will now be called correctly when response is ``401 Invalid OAuth token``
         - Fix reconnect loop when Twitch sends a RECONNECT via IRC websocket
+        - Fix :func:`~twitchio.CustomReward.edit` so it now can enable the reward
 
 - Other
     - [speed] extra

twitchio/http.py

@@ -421,7 +421,7 @@ async def update_reward(
             "prompt": prompt,
             "cost": cost,
             "background_color": background_color,
-            "enabled": enabled,
+            "is_enabled": enabled,
             "is_user_input_required": input_required,
             "is_max_per_stream_enabled": max_per_stream_enabled,
             "max_per_stream": max_per_stream,