During the early phase of work on DSDS, we found that a hacky solution
to seeing duplicate subscriptions that are part of a logical group (eg
Google Fi) was to filter out the entries with empty MNC strings. It
turns out this breaks things for some legitimate eSIM subsctiptions, and
isn't needed anymore because of the fixes that landed for b/127833821.
Fixes: 130706446
Test: make RunSettingsRoboTests
Change-Id: Ic4472c1de3c3e2449139b3e2ffb20d11a0058e8a
972bf437f6