Fix app name in call screening privacy notification

Set the app name correctly in the CallScreeningServiceFilter and add a
test to verify. Also clean up an awkward-looking equals method that was
causing the new test to fail.

Test: atest TelecomUnitTests:CallScreeningServiceFilterTest
Fixes: 150214111
Change-Id: I7bdd428f571428c3756e8cbb74fda44baa18f6af
3 files changed