bug#51974: 29.0.50; [PATCH] Fix deactivation of outline-minor-mode-cycle-map bindings

[Juri Linkov]

> Also outline-minor-mode-highlight-buffer that is a non-font-lock-based
> counterpart of outline-font-lock-keywords needs an opposite function
> to unhighlight the non-font-lock buffer by removing only faces and keymaps
> that outline-minor-mode-highlight-buffer added to the buffer.
> But this should be easier to do since it uses overlays.

Sorry, I forgot it already does (remove-overlays nil nil 'outline-overlay t).