Collapse extra raw contact editors

There are now two different header styles
1) When creating a new raw contact: if there are multiple
 accounts to create the raw contact under, then show a
 header with an acconut selector
2) Otherwise, show a visually distinct account header without
 a drop down account selector. If there are multiple raw
 contacts, this header also lets you collapse raw contacts

Typical users, who only have a single writeable account, will
never see header (1). This is fortunate, since switching between
the two header styles is a bit visually inconsistent.

Bug: 18004959
Change-Id: I133a7355a220f20b55657a6c1a51ff44665ea3b9