Fixes incorrect array type comparison

A prior change used ArrayUtils.contains to search an int among an array
of UserInfos. This was resulting in never running the optimized user add
flow in AppsFilter.

Test: atest --user-type secondary_user AppsFilterTest AppEnumerationTests
Test: [create 2nd user; run as primary] atest AppsFilterTest AppEnumerationTests
Bug: 187853334
Change-Id: I8e0a5a4acbf8f06eb7932fb1953ff2af0baf8424