guess-indent now requires setup

[BitPusher16]

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NOTE
Please verify that the base repository above has the intended destination!
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
to the original project then adjust the base repository accordingly.

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[dotfrag]

This already exists in #1627 and #1532.

FWIW, with lazy.nvim, you don't need to run the .setup() function. You can use either opts = {} or config = true. I personally prefer opts = {} because if I wanna change an option it feels more seamless.