Bug 12421: no way to get back to search results from overdrive results

Bug 12421: no way to get back to search results from overdrive results

When on your search results you can click the link to overdrive results,
but then you can't get back to your catalog search results, the
line that links to the results should be there on both pages.

Test Plan:
1) Apply this patch
2) Enable Overdrive searching
3) Perform a search
4) View the overdrive results
5) Note the "Catalog search for '$q'" link in the breadcrumbs
6) Click the link
7) Note you return to the search results page

Signed-off-by: Barry Cannon <bc@interleaf.ie>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit cbee8477976f2424a49867ab39fcbcc53ad7cf53)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>