Use MATCH_DEFAULT_ONLY for and only for activity resolution.

Previously CATEGORY_DEFAULT wasn't added for activity resolution,
which was required for an activity to be implicitly resolved by
Context.startActivity() and Intent.resolveActivity(), thus required by
most default apps.

Bug: 110557011
Test: manual
Change-Id: I5c494f677052121e8e016c2c0f5f52e7283026b6