Update the style of emphasized notification actions.

* This removed many of the differences between CallStyle and emphasized actions.
* These actions are now pill shaped with a solid bg color, no stroke, less height, less spacing between, and wrapping content instead of splitting space equally.

Fixes: 187533622
Test: manual testing with Notify, Notify2, and Clock (using timers and alarms)
Change-Id: I8c554755755c59f2756870f7cd2e0c533d22d823