fix shaky sprites on scrollZoom

[mollymerp]

Sprites wiggle around on scroll zoom because map.isZooming() always returns false due to the order of operations in the render loop, because it checks ScrollZoomHandler.isActive() which is set back to false by the time it is called here

mapbox-gl-js/src/ui/map.js

Line 1634 in 61ae8d2

zooming: this.isZooming(),

and painter.options.zooming is used to choose the texture filter

mapbox-gl-js/src/render/draw_symbol.js

Lines 111 to 112 in e682aa6

	tile.imageAtlasTexture.bind(isSDF || painter.options.rotating || painter.options.zooming || iconScaled || iconTransformed ?
	gl.LINEAR : gl.NEAREST, gl.CLAMP_TO_EDGE);

I don't have many good ideas on how to test this 😬

Launch Checklist

• briefly describe the changes in this PR
• write tests for all new functionality
• document any changes to public APIs
• post benchmark scores
• manually test the debug page

[ChrisLoer]

This change looks right to me. It does seem like it'll be hard to write an automated test that's not too contrived to be useful.

I'm having trouble manually testing this though, how did you do it? I've been trying scroll animations while looking at highway shields, and I think I see the change, but honestly it's subtle enough I could be imagining it.

[mollymerp]

for posterity: the shakyness is hard to see on retina screens, but very visible on lower-resolution devices.