Make QSCarrierText always selected

We were changing selected value with visibility and that was making the
Carrier text become selected when QS expanded, capturing focus when it
shouldn't. This had also the effect of selecting it on HUN.

This change makes QSCarrierText always selected=true and only changes
its ellipsize with visibility

Test: manual, start expanding QS
Test: manual, send Hangouts message
Fixes: 129661790
Change-Id: I6c60ce288a1875cfd7854ad888170fdd77b2c65a