Bug 17074: Fix links in result list of 'scan indexes' and keep search term visible

Bug 17074: Fix links in result list of 'scan indexes' and keep search term visible

The 'scan indexes' search that can be reached from the
advanced search has 2 problems to begin with:

- The search term you searched for is not displayed
  in the input field.
- The links in the result list are missing the index
  and because of that, are not giving the correct results.

To test:
- Go to the advanced search, select an index to search in
- Enter a search term and check 'scan indexes'
- Submit search
- Check if the search term is visible in the input box
- Check if the result links contain your selected index
  and give you correct results (count and the number of
  results should match)

Tested both patches together, works as expected.
Signed-off-by: Marc <veron@veron.ch>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>