Fixes AppsFilterTest

This change fixes the AppsFilterTest#testWhoCanSee to properly validate
/ assert. The initial commit used a mistakenly created local method to
"assert" instead of the intended hamcrest assert method. Oops.

Test: atest AppsFilterTest
Bug: 143534210
Change-Id: Ibd2de769d63a166f225e2bec75d27eaff2343ee9