browserIntent needs proper flags for PendingIntent

Previously the browserIntent was updated after the call to
PendingIntent.getActivity. It should be updated correctly
before the PendingIntent.getActivity call so that the
PendingIntent is correctly created for the browser instead
of the Instant App.

Test: Existing tests, manually tested fixed behavior.

Bug: 35873804
Change-Id: Ie77344a4190fbc6a3896b02e3adfcdd29985006d