Revert "settings: add SuperUser"

This reverts commit 9ffd37abeaff16cc22e2d79d6b8053b5b27c0a3d.

Conflicts:
	AndroidManifest.xml
	proguard.flags
	res/values/slim_arrays.xml
	res/values/slim_strings.xml
	res/xml/development_prefs.xml
	src/com/android/settings/DevelopmentSettings.java