Contact picker/group list pixel-perfect

There are still a few issues to be fixed around picker
stuff, but it looks basically fine enough.

- fix misc padding issues around contact listing itself
- introduce conditional padding for phone search view to keep
  top padding consistency
- keep consistency between group and contact listing
- remove "groups per account" count
- stop showing quick scroll bar in group list

Bug: 5137457
Bug: 5144140
Bug: 5143350
Bug: 5080599
Change-Id: I038c112bbf9e956e9a2b784178c0360d03e3f333