Settings: update Privacy Guard help text string

Fix tiny error plus shorten string a bit

Change-Id: I3453d677a5bce8d8f58539d71283d47fe4a4cbf4
Signed-off-by: Ricky Salinas <rsalinas1@mail.usf.edu>
Merge branch 'cm-11.0' of git://github.com/CyanogenMod/android_packages_apps_Settings into cd-4.4