[DO NOT MERGE] Contacts to display UI improvements (1/2)

* Remove the wrench icon.
* Move arrow to the right.
* Move list item to the left to be aligned with back button.
* Remove tablets layout so that it looks similar on phones and tablets.
* Add SAVE button to toolbar.
* Left-align "Contacts in custom view" header with hamburger menu.
* Change account text color when it's expanded/collapsed.
* Add divider view below group item so that we can show dividers between accounts
  by wrapping the existing content in custom_contact_list_filter_group with a
  LinearLayout and putting a divider below.
* Change text color.

Bug 30198034

Change-Id: Id4bc9e65fbf163195e7e1ce3847735e5d9af848c
(cherry picked from commit 56432fc8c78305d9f108a83f3c9a92153dc5ab5c)