Merge "Update transient taskbar shadow alpha for light/dark theme." into tm-qpr-dev am: d22b3af8

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/22235599



Change-Id: Ie6b6229342e4c6d473d98ee4594d648095f5babc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>