Hide Inline Assist button if assistant.button is disabled (#7932)

This PR adds check for `assistant.button` setting in quick bar, to hide
it when the setting is set to false. It seems that the setting can be a
separate one, I would be happy to add it if needed.

Release Notes:

- Improved `assistant.button` setting so that `Inline Assist` button in
editor quick bar is also hidden
([#4500](https://github.com/zed-industries/zed/issues/4500)).
a041e07c99Aleksei Trifonov committed on 2/18/2024, 6:14:08 AM· committed by GitHubparent6d9b8cc
2 files changedLine totals unavailable