Prioritize ContentTitle over the SubText

Previously, we shrunk the title to a minimum width, then showed the subtext with the remaining space. This felt like a poor balance, where we'd rather get as much of the title as possible.

Bug: 163626038
Test: manual - using Notify's drag resizing was really helpful
Change-Id: I8045cb473cbb42f04e3054fb40bda2ac427e693e