Move Superuser header below Developer Options

Change-Id: Ica85aae0d3f06e6c5e837946cfc893d9e2f4fb7d

Conflicts:
	res/xml/settings_headers.xml

 Author:    Chirayu Desai <cdesai@cyanogenmod.org>
 Changes to be committed:
	modified:   res/xml/settings_headers.xml