This makes the number presented to the user consistent between
Settings and the notification. Previously the notification used
SI units while Settings used IEC units.
I haven't tested the TYPE_LIMIT_SNOOZED notification as I'm not
sure how to trigger it (though I don't see any reason why it
wouldn't get the same treatment).
Bug: 91635986
Test: manually:
1) set a limit for 10 MB
2) use >10 MB of data
3) verify notification and Settings agree on data use
Change-Id: I31f157332ac273ae260651eb426ab97258180176
a6101e8b2d