config guess-indent in setup

[WindSoilder]

---

NOTE
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Github by default opens Pull Requests against the parent of a forked repository.
If this is your personal fork and you didn't intend to open a PR for contribution
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It seems that guess-indent doesn't work unless you assign config manually, here is what I get from https://github.com/NMAC427/guess-indent.nvim:

-- using packer.nvim
use {
  'nmac427/guess-indent.nvim',
  config = function() require('guess-indent').setup {} end,
}

And after define config property, it works well for me.

[bewuethr]

This is also the subject of #1532, #1598, #1652, and included in #1627.