Make QS signal indicator act like a QS signal indicator

It had the behavior of the status bar before, so switch it over to
QS behavior but keep status bar icons for the appearance. Ditch
the old QS data icons because we no longer need them.

Test: runtest systemui
Change-Id: I1356bbc19c4874ae467e192b9129136ebd0a37c8
Fixes: 62128809