bug#64543: [PATCH] package-report-bug: don't fail on custom groups defined by eval

[Eli Zaretskii]

> Cc: 64543@debbugs.gnu.org
> From: sbaugh@catern.com
> Date: Wed, 12 Jul 2023 19:26:13 +0000 (UTC)
> 
> +(defun uniquify-dirname-transform-default (dirname)
> +  "Simply return DIRNAME unchanged."
> +  dirname)

If you don't explain the need for its existence in the doc string,
this function looks weirdly redundant.

> +(defcustom uniquify-dirname-transform #'uniquify-dirname-transform-default
> +  "A function to transform the dirname used to uniquify a buffer.

Come to think about it, why not use 'identity as the default value?
Then the above weird function could be deleted.