Support disabling same features for the preview window of telescope

[fu yiming]

This plugin is useful for editing files.

But the preview window of telescope in nvim is often to use, and if the first file in the oldfiles list is just a big file, it will get blocked.
So I hope the same features can also be disabled in the telescope preview.

I don't know if it is easy to implement, I just think this is very useful then post this issue.

Thank you!