Decide on `next-status -r mono` reporting of a submodule with new commits

[mih]

Capturing the fact for later decision making:

❯ datalad next-status -r
 modified: static/sched/distribits2024.xml (file)
 modified: themes/PaperMod2 (submodule) [new commits]

❯ datalad next-status -r mono
 modified: static/sched/distribits2024.xml (file)

❯ git status
On branch main
Your branch is up to date with 'origin/main'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   static/sched/distribits2024.xml
        modified:   themes/PaperMod2 (new commits)

The superdataset expects a different commit to be checked out in the subdataset. mono gives no indication that this is the case.