use useEffect for key listeners on camera control panel #7827
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The PTZ camera controls on birdseye and the individual camera components has a key listener that was triggering after the component was unmounted (when moving from birdseye to editing the config, for example).
I was able to reproduce the issue on both Safari and Firefox. Use the plus or minus keys to zoom in/out, then navigate to the config editor and type a dash.
This PR moves the keyup and keydown listeners into callbacks and implements useEffect.