Fix tests for time format in settings

Because now we use different time format across the settings app.
We need to update all the tests.

Bug: 76113036
Test: RunSettingsRoboTests
Change-Id: Id4f7d55775adfdeb1aa0ae234f35d515ced4f450

tests/robotests/src/com/android/settings/fuelgauge/PowerUsageSummaryTest.java

@@ -208,7 +208,7 @@ public class PowerUsageSummaryTest {
         mFragment.updateLastFullChargePreference();
 
         assertThat(mLastFullChargePref.getTitle()).isEqualTo("Full charge lasts about");
-        assertThat(mLastFullChargePref.getSubtitle().toString()).isEqualTo("2h");
+        assertThat(mLastFullChargePref.getSubtitle().toString()).isEqualTo("2 hr");
     }
 
     @Test