Migrate away from deprecated Truth APIs. am: 041b499d83 am: f3eb6ad182 am: 666e2f6c28 am: f5135d2c53

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/localepicker/+/1437940

Change-Id: I65d68a870124cd79cd8ede0dd82cbf580cbf04c9