Use delta Y change for quick zoom

[LukasPaczos]

Users are reporting that a zoom level during a quick zoom gesture does not return back to the origin when the pointer is moving back and forth. This is most likely caused ACTION_MOVE events summed up displacement not being equal to 0 when the gesture is performed, which in consequence returns an un-even scale factor.

We could explore setting the zoom level based on the delta Y of a pointer in relation to the gesture origin which should give us consistent results.

Refs #11240.