LP#1724348 Honor default tab from catalog search

LP#1724348 Honor default tab from catalog search

The default tab selection was not being honored from catalog searches,
as the search had already set $scope.record_tab, and we were honoring
that value in all cases.

Instead, let's honor that value in cases where the OPAC load doesn't
change our current record, which should only happen if we load the
record directly to a non-opac tab, then go to the OPAC view.

To test:
1) Set any tab other than "OPAC View" as your default view in record
details.
2) Do a catalog search.
3) Select a record, and notice your default view is not set.
4) Apply patch, do the same steps, and notice the default view is now
selected.

To test regression of bug #1708951:
1) In Firefox, load a record directly (e.g.
/eg/opac/staff/cat/catalog/record/123).
2) Note the default view loaded.
3) Click "OPAC View".
4) Note the view does not return to your default view, but stays on
the OPAC.

Signed-off-by: Dan Wells <dbw2@calvin.edu>
Signed-off-by: Jason Boyer <JBoyer@library.in.gov>