ad NEWSeekbarPreference specifically for progressbar

Change-Id: Ib91a40b9822d45e860b180eb002353d925a291b4
Signed-off-by: scott <scott@ubuntu>
minor change

Change-Id: I17bd6f3b58c32f7fb02d6cc8cd2de71c4de7d2ef
Signed-off-by: scott <scott@ubuntu>