Fix can't find default theme bundle for some specific languages. am: 2919222db3

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/13277991

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I662037aefc7c7699e7fa52f98b5e160e0ecf11cb