Add locator for "SOFT_KEYBOARD_HIDE_BUTTON" as part of fixing AccountSettingTest#testAddRemoveAccount

Test: https://android-build.corp.google.com/test_investigate/invocation/I39900010327971917/test/TR40729485700464032/

Bug: 364861264
Change-Id: Ieba6e63d0fc9b649004201c4dd14849c531e7fad
2 files changed