Make Sinerider playable on Firefox

[jorendorff]

This PR makes "catching-up" code in tick() unconditional, so that even if we miss a frame, physics keeps ticking along at normal speed.

This is necessary in Firefox, because there Canvas rendering is happening on the CPU. (I am still trying to figure out why that's the case.)

This addresses #547 enough that the game is playable (though very choppy) on high-pixel-density displays.

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Name	Status	Preview	Updated (UTC)
sinerider	✅ Ready (Inspect)	Visit Preview	May 17, 2023 2:35pm

[polytroper]

Awesome work, thanks so much. Sorry for the slow review here, I have been busy moving into a new house.