Merge "Fix low contrast text in add user dialog." into udc-dev am: 59ecd6a4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23450544



Change-Id: I5ca19d41f39d753796ed3e929550cd7db51a1a05
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>