fix: Raise WebSocketClosure on protocol level errors

[Jegarde]

Summary

My bot crashed from the exception aiohttp.http_websocket.WebSocketError: Received fragmented control frame. Did some research and the exact same crash was reported in this discord.py discussion. This pull request applies the same patch made for this issue in this discord.py commit.

Information

• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed).
• This PR is not a code change (e.g. documentation, README, typehinting,
  examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.
• I have updated the changelog to include these changes.

[Lulalaby]

Nvm, please merge the else block with the one after it since it will do the same then