Misc fixes for notification

- Tweak alignment for footer preference icon and text
- Hide app info button from app notification settings header

Merged-In: I10803e78fe4f30c2d84ec795c343ed660aab7762
Change-Id: Ia95fc30025c042635ad6467c7fde51991b0c47d9
Fix: 62138362
Fix: 62708686
Test: visual and runtest --path AppNotificationSettingsTest.java