Misc fixes for IA and pattern.

Disable NFC fragments when feature is not avaiable
Link to spell checker screen with the pref is clicked
Tint "add"/"delete" button in UserDictionary actionbar to proper color.

Change-Id: I8a8e219ce3dbbafc6c4d5a0f34f835ffd0abad4f
Fix: 34155679
Fix: 34161006
Fix: 34154795
Test: RunSettingsRoboTests