internal/frontend: display module view for non-redistribuable packages
internal/frontend: display module view for non-redistribuable packages

Fixes b/136470455

Change-Id: Ibc0595172a62ff8c9e5e48beb418d4fce6621912
Reviewed-on: https://team-review.git.corp.google.com/c/golang/discovery/+/498825
Reviewed-by: Robert Findley <9179eee875d1ee628c37fb47d7e749e855ffd21f@google.com>

golang/pkgsite,golang/pkgsite,golang/pkgsite,golang/pkgsite