Fix domain verification CATEGORY_DEFAULT check

The category is actually not added to startActivity Intents
automatically, instead relying on the MATCH_DEFAULT_ONLY flag being set.
This updates the Intent validity check to match.

Bug: 179683649

Test: manual, launch without DEFAULT, with MATCH_DEFAULT_ONLY

Change-Id: I00b78d596ee05c5a4a228771bbf8082af2b0ab8a