[Statusbar] Hide operator name by default; fix paddings

There are three main fixes here, all relating to the improper layout of
the clock on the home-screen status bar:

1. The OperatorNameView is now getting inflated by default by Dagger,
   which is fine. But it was never hidden. This change makes it GONE by
   default so it does not push the clock over unnecessarily

2. For some reason, the left-side padding was 2x the right side padding
   for the status bar contents. Made them equal

3. Reduced the embedded left-side clock padding that is read by
   Clock.java from 7dp -> 4dp. This makes the clock align more with the
   battery. They're off by only one pixel now!

This entire area is under construction, so it makes sense to manually
tune things for now. In general though we will be looking at making
these layouts more programmatically-correct rather than requring
screenshot analysis.

Test: manual; comparing screenshots
Bug: 322779840
Flag: NONE
Change-Id: Iaf0784d7f39b26c5f94f4ceae5bcc56732344831