bug#46364: regression in lm-commentary

[Boruch Baum]

In emacs 26, lm-commentary functions fine.
In the emacs-snapshot that I'm using from ~2020-09, it does not
correctly indent sub headings.

This was observed for the lisp file[1], as processed by MELPA[2], and
reproduced by me locally. I don't know what version MELPA is using.

My correspondence with MELPA support can be found at the github issue
here[3].

refs:
=====
[1] https://github.com/Boruch-Baum/emacs-diredc
[2] https://melpa.org/#/diredc
[3] https://github.com/melpa/melpa/issues/7398

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