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remove mousemove callback when there's no longer a cat - fix #1158

dakkarrequested to merge
1158-stop-leaking-cat-callbacks into develop

What does this MR do?

This removes the mousemove event listener when removing the cat, so we're not leaking listeners.

While I was there, I marked the callback as "passive", which should improve performance (see https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#using_passive_listeners )

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Closes #1158 (closed)

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