Remove non-updatable contribution from android_test_stubs_current_contributions

This change fixes the defaults definition so that it is more aligned to
the definition of other android_*_stubs_current_contributions, which is
created in frameworks/base/api/api.go

Test: m nothing --build-from-text-stub
Bug: 301318660
Change-Id: I056807c8c0bbdebda5b4ca9704f4f65e99b7f433