Fix SaveUi to properly resolve for instant apps.

This issue causes CTS test failures while running instant mode tests.
This patch will help partners pass instant mode CTS successfully.

Bug: 153099178
Test: atest --instant android.autofillservice.cts.SimpleSaveActivityTest
Change-Id: I2bd6c553c75a1a207d7bfd7113aad5e377880b3e