FEATURE: Don't show the 'Next Month' option in date pickers at the end of the month 2 (PR #15523)

The second step for the fix I’ve done in FEATURE: Don't show the 'Next Month' option in date pickers at the end of the month by AndrewPrigorshnev · Pull Request #15492 · discourse/discourse · GitHub.

That PR addresses date-time pickers on

  • the bookmark modal
  • the topic timer modal

This PR does the same job for other pickers (for example, for the picker on the slow mode modal).

GitHub

I think this can wait till after the release.