[Notif] Disable "Customize" for blocking helper

Update UI to hide customize when blocking helper is showing. Fixed a
small problem with context.getString too where it was unnecessarily
passing in a format string argument.

Test: Visually
Test: Ran atest NotifInfoTest with new test case
Fixes: 77321231
Change-Id: Ia03ea7badc7aa7ccd7b3a0e235cce2363ace9953
2 files changed