Remove unused libcore.icu.ICU from LocaleStoreTest am: 686c483147 am: 05a9835cfc

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/localepicker/+/12128094

Change-Id: I96ebab4559ca188b0f5fd13e0320ff0a68be0e18