Followup to https://codeberg.org/forgejo/forgejo/pulls/9359. `templates/repo/issue/list.tmpl` had buttons changed which had `.disabled` on them conditionally.
* adjust devtest page to have such buttons
* implement `.disabled` for the newer buttons that does the same thing as the `.ui` buttons do: apply custom opacity, disable pointer events
* this is the most boring way of implementing this
Reported-by: @Gusted
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/10410
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
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