Revert "Add preference for enabling root access"

This reverts commit d4e820e8662e3efc790ecafbf6d3f95c09d4d54e.

Conflicts:
	res/values/strings_custom.xml
Revert "Switch to new Superuser"

This reverts commit 4d53ea39c2eedb322fdf9756548cac35cd3c0a61.

Conflicts:
	res/xml/settings_headers.xml