Visual updates for popup

- Update some dimens
  - Increase left padding for shortcuts
  - Adjust arrow and notification ellipsis offset accordingly
  - Align shortcut dividers to be same width as text
  - Notification text 14sp instead of 15sp
  - Increase width of popup by 12dp
- Shortcuts text 87% black instead of 54%
- Arrow has same color as attached side, so takes on header
  gray instead of white when appropriate

Bug: 37753827
Change-Id: I0844b85995f22218a3b7e605e1653cceaed6cda1