LP#2007603: restore functioning of default search tab preference

LP#2007603: restore functioning of default search tab preference

This patch restores the ability of the staff catalog search
preference for setting the default search tab to function as
expected.

To test
-------
[1] Set the default search tab preference to something like
    'MARC' in the Angular staff catalog.
[2] Navigate away from, then back to the search form.
[3] Note that the active tab is set to 'keyword'.
[4] Apply the patch and repeat step 2. This time, the active
    tab should match the preference.
[5] Verify that direct navigation to a specfied tab (e.g.,
    /eg2/en-US/staff/catalog/search?searchTab=ident works
    as expect - in particular, if you specify a searchTab
    in the URL, the preference should be ignored.

Signed-off-by: Galen Charlton <gmc@equinoxOLI.org>
Signed-off-by: Jennifer Pringle <jennifer.pringle@bc.libraries.coop>
Signed-off-by: Jeff Davis <jdavis@sitka.bclibraries.ca>