Adjust user-update CTS test to account for modified icons in MODES_UI Bug: 333901673 Test: atest NotificationManagerZenTest Flag: android.app.modes_ui (cherry picked from https://googleplex-android-review.googlesource.com/q/commit:027d924a26a6f2a0a4a010cf69b7656cd05aaabd) Merged-In: I294a79041bcb1bebaf6cfb1d7d0f14d2a25f33b1 Change-Id: I294a79041bcb1bebaf6cfb1d7d0f14d2a25f33b1