plugins/stickykeys: Unlatch keys after mouse click

Nicolas Fellarequested to merge
work/nico/sticky-mouse into master

This is how X11 behaves and it allows things like Ctrl+Click to work as expected with sticky keys

See https://discuss.kde.org/t/sticky-modifier-keys-dont-depress-on-mouse-click/15384

Edited by Nicolas Fella

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