Fix required parameters validation error

[Middledot]

Summary

def run_bot():
    bot = CustomBot()

    @bot.slash_command()
    async def test(ctx):
        pass

    bot.run(...)

Traceback (most recent call last):
  ...
  File "discord\commands\core.py", line 681, in _parse_options
    params = self._check_required_params(params)
  File "discord\commands\core.py", line 675, in _check_required_params
    raise ClientException(f'Callback for {self.name} command is missing "{p}" parameter.')
discord.errors.ClientException: Callback for test command is missing "context" parameter.

command.__qualname__ is run_bot.<locals>.test
I figured this fix would be better than manually patching edge cases.

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.

[Dorukyum]

Good chat, but I don't get the point of is_in_cog; isn't that just .cog is not None

[Middledot]

.cog is None by default so there would need to be a trigger to start validating the options. But it can be replaced with the cog attr.

[Dorukyum]

Looks good, thank you