Bug 35157: Remove spans from patronfields.inc

Bug 35157: Remove spans from patronfields.inc

To test:
1. Run any page that contains the "Search patrons" search bar through an HTML validator and you will see a lot of:

        Stray start tag span.
        Stray end tag span.

2. Apply patch
3. Try step 1 again, no more errors from the HTML validator.
4. Make sure the patron searches still work when limiting by 'Search field'.

Signed-off-by: Brendan Lawlor <blawlor@clamsnet.org>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>