Does not use passive listeners to improve scrolling performance

[rabinadk1]

I got this during the diagnostics from the Chrome Lighthouse.

Consider marking your touch and wheel event listeners as passive to improve your page's scroll performance. Learn more.

[Sergiobop]

+1

[estanglerbm]

wheelPreconditions() can call preventDefault().

Hammer.js (for touch events) also can call preventDefault(). Don't know if CSS touch-action + touchAction = auto would be a future possibility.

Maybe all this doesn't matter with latest browsers if they default these events to passive, anyway.

[kurkle]

fixed by #856