Use experimental API for Icon tint.

I'm not sure why but sometimes icon has incorrect tint which is the same
as the colour of the slider. This makes it look invisible (despite
actually being there).

Bisecting the reasons I discovered that either reverting ag/32950579 or
using experimental API fixes the problem. It's pretty easy to reproduce
when rapidly adjusting the slider. I also tried reverting the last
Compose library update with no success.

This didn't happen before because the slider was snapped to the
intermediate values and adjusting speed was restricted to a much lower
value because of that.

Flag: com.android.systemui.volume_redesign
Fixes: 415250598
Test: atest VolumeDialogScreenshotTest
Test: atest VolumePanelScreenshotTest
Test: manual on foldable. Adjust volume and observe the icon
Change-Id: Iaa6ee160f3aba5830a5cf50673a362309474d1de