Update battery strings to respect user 24 hour setting

ICU on android doesn't respect users 24 hour setting by default.
This CL makes it so that tell ICU what the users setting is so that
it will respect it.

Test: robotests updated
Bug: 77483888
Change-Id: I46eec2a10530b8b490f6a681c3a9b0a9dd4d68bd