Fix NPE in dock mode.

Add the call recording button also to the landscape layout. Also
properly add (and hide) button spacers.

Change-Id: Idc4c7669a78a7445a421bc28bd527f6d423f5c6a
Signed-off-by: anerikg <anerikgames@gmail.com>

Conflicts:
	res/layout-land/call_button_fragment.xml
	src/com/android/incallui/CallButtonFragment.java