Merge "Limit existing usages of nav bar button alpha to two button mode" into sc-dev am: d7d65aa697

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/13841869

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I127918dc8cc15bc967779261af5b0d8361c2086a