Use suspendAnimate to cancel the previous animaiton when the next event arrives.

Flag: com.android.systemui.volume_redesign
Fixes: 398130553
Test: atest VolumeDialogScreenshotTest
Test: manual on the foldable. Dialog appears and disappears with an
animation

Change-Id: I29e83cdf39237cdf5de8899d125a866bdf1d6bc3