clutter/evdev: Fix toggling accessibility features from keyboard

clutter/evdev: Fix toggling accessibility features from keyboard

Enabling keyboard accessibility features on Wayland from the keyboard
was wrongly assumed to be controlled by the "togglekeys" setting,
whereas it should be simply controlled by the "enable" setting.

As "togglekeys" is off by default and doesn't have a UI option to
enable, that would prevent turning on or off the keyboard accessibility
features using the keyboard.

Bug: https://gitlab.gnome.org/GNOME/mutter/merge_requests/501
Origin: upstream, 3.30.3, commit:6be39612991d973f69b5dc652076acbe94f49f99

Gbp-Pq: Name clutter-evdev-Fix-toggling-accessibility-features-from-ke.patch