fix(zen-mode-nvim): ensure winbar stays disabled and restore old mini.indentscope options

[Subjective]

Previously, the winbar would enable itself on various events (switching buffers, writing to file, which-key popups, telescope, etc.) I added an autocmd that will disable the winbar for all these events while ZenMode is enabled. This does feel a bit hacky though, so please let me know if there's a better way to toggle the winbar.

Additionally, this fixes an issue where previous mini.indentscope options would not be restored upon exiting ZenMode.

[github-actions]

Review Checklist

Does this PR follow the [Contribution Guidelines](development guidelines)? Following is a partial checklist:

Proper conventional commit scoping:

• If you are adding a new plugin, the scope would be the name of the category it is being added into. ex. feat(utility): added noice.nvim plugin

• If you are modifying a pre-existing plugin or pack, the scope would be the name of the plugin folder. ex. fix(noice-nvim): fix LSP handler error

• Pull request title has the appropriate conventional commit type and scope where the scope is the name of the pre-existing directory in the project as described above

• README is properly formatted and uses fenced in links with <url> unless they are inside a [title](url)

• Proper usage of opts table rather than setting things up with the config function.

[owittek]

Could you please elaborate the PR and/or split the changes in two commits? The refactor makes it really hard to follow the changes.

[owittek]

👍