Clear artificial hover on blur

Clear artificial hover on blur

Previously, if you focused an element using an `f` command and then pressed
`<tab>` to focus the next element, or if the element was automatically blurred,
the element would still look hovered until you pressed `<escape>`. This is
because many `f` commands lock the `:hover` pseudo-class on their target
element. This commit unlocks that pseudo-class if that element blurs, preventing
elements from getting "stuck". It is only done if the element itself is blurred,
not if anything else is. That's to make sure that dropdown menus opened using
`zf` don't close unexpectedly.