Merge "Fix "square corners" appearance of new Back Arrow" into tm-qpr-dev am: 81fb6def

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19399076



Change-Id: Ic79f0822364182263dffd3ac494353f779f6af3b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>