Don't fall back to domain verification state when looking up app linkage state

This is in support of the always/never/ask UI tweaks in Settings: any
"assume always" fallback at the verification layer should not be
conflated with the user-facing semantic toggle.  This was causing the
UI to report apps as being in the 'always open their links' state
inappropriately.

Bug 22532193

Change-Id: Iaa4bc3a2d5db814e1b0d96bc1c4ecfaafb1e3105