Revert "Added the testdata directory of bob.example.faceverify as a top-level source (hopefully, they now get installed)."

This reverts commit c38fea3521587ec1e5cd5c24604623f20ad09b98.
Added the testdata directory of bob.example.faceverify as a top-level source (hopefully, they now get installed), now without xbob.db.mobio2.