Mark ada-mode itch as scratched

The way upstream handled that one was somewhat confusing.  The
timeline I remember:

1. November 2021: bug opened.

2. May 2022: bug closed, with no acknowledgment of patches whatsoever:

   > Date: Sat, 28 May 2022 04:15:57 -0700
   > Closed by ada-mode version 7.2.1, uniquify-files version 1.0.4.

   _AFAIR_ (and this is where I doubt my own sanity), those new
   versions were never pushed anywhere public?

   The commit dates that eventually made it to the GNU ELPA repo show
   that the patches were applied on May 28, so you'd think I should
   have been able to see them, but I distinctly remember seeing the
   bug-closed notification and expectantly looking at GNU ELPA (via
   list-packages, the website, and finally fetching from the git repo)
   and seeing *nothing*.

3. July 2022: the new package versions mentioned in the bug-closed
   notification are finally published on GNU ELPA; elpa.git is
   updated; I check the log and don't see my patches; I check the
   sources and do end up finding my changes.

OT1H I certainly won't presume to tell upstream how to handle user
contributions; OTOH the combination of (1) the curt closing message
that neither ACK'ed nor NACK'ed the patches (2) the months-long radio
silence between closing and releasing (3) the loss of attribution, all
make for a rather austere contribution process.

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