In High usage, hide apps without screen time.

If the screen time is less than 1 minute, don't show it in high
usage dialog.

Also sort the list first before cut the list size.

Change-Id: I2f8876dcc16b3d6156cb0aa9e19c7fdd4ceac34e
Fixes: 77303928
Test: RunSettingsRoboTests
2 files changed