Fix for PartialMessageable TypeError in ext.pages

[krittick]

Summary

This fixes the following error, which can occur if the paginator is sent after a deferred response:

TypeError: Expected TextChannel, DMChannel or Thread not <class 'discord.channel.PartialMessageable'>

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, ...)