bug#73175: 30.0.60; toggling emacs-news-view-mode doesn't remove buttons

[Robert Pluim]

>>>>> On Fri, 20 Sep 2024 10:57:53 +0200, Robert Pluim <rpluim@gmail.com> said:
    Juri> Probably it would be the right thing to move this code to 
`button-mode'
    Juri> to remove properties when it's disabled.

    Robert> That would be best (assuming Iʼve got the incantation right ;-))

Although `button-mode' is described as a mode for button
*navigation*, so changing its behaviour might annoy people. Weʼll let the
maintainers decide that one ☺️

Robert
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