Mms: adds the option to hide sprints vm text messages, but still allows sprints vvm to receive messages.

This fixes the missing code form the merge.
Patchset 2: Add braces and fix import.
Patchset 3: Cleanup.

Change-Id: I7ffe257ee7df05324183c6985157fef94847bda1
Merge branch 'cm-10.1' of github.com:CyanogenMod/android_packages_apps_Mms into cm-10.1