hammerspoon: simplify keyUp handling
hammerspoon: simplify keyUp handling

Not too worried about these edge cases (non-matching flags) any more,
based on my testing.

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent