Remove default app duplicates in search

Default Work Browser and Phone app search results look
identical to the regular defaults. Supress the results
until we differentiate work results.

"Assist and voice input" duplicate is a parent-child
duplication and is removed, as well.

Bug: 36101902
Test: make RunSettingsRoboTests
Change-Id: I3bb75c199cd76e24de42548dd166c4bccd0c7f0a