TAPL tests - make all apps in overview checks less fragile.

Tests that check for all apps in overview mode were only checking for
actions being enabled. This isn't sufficient logic, two button mode also
uses all apps.

Centralize the check for all apps.

Test: local tapl tests
Change-Id: If1bf98019e6f1aea8f7967883aba6780743e9d6b
2 files changed