Fix error with option default params

[Ratery]

Summary

Fixed a bug when passing the option default value doesn't make it non-required.
For example:

@bot.slash_command()
async def command(ctx, opt: Option(int) = 123):
    ...

• Checklist

• 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
• 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, ...)