Bug 33484: Fix patron search form

Bug 33484: Fix patron search form

Reset DT's filters if we are searching again using the search form.

If you use the form on the left we need to reset the different filters
that could have been set from a previous state we loaded.

Signed-off-by: Pedro Amorim <pedro.amorim@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>