Make compose disappear when search action view is expanded

On certain phones, limited screen width makes the search action view
look confined. Show the compose menu item only when there is no action
view.

Bug: 8747635 Compose button should not show when the user is trying to
             do a search (on phone)

Change-Id: I129e6b4474b2c3f93d86abb5eaaa1dd135285912
1 file changed