Bug 32505: Restore patron search by formatted dob

Bug 32505: Restore patron search by formatted dob

Prior to the rewrite of the patron searches (bug 30063 and friends) it
was possible to search for a patron using their date of birth, formatted
following the dateformat syspref.

Now it only works if the date is iso formatted.

This patch is providing a fix to restore the behaviour, but does not
make it consistent. Only searching patrons by date of birth is fixed
here, when we actually want to fix the problem for the REST API DT
wrapper instead.

Test plan:
Search for patrons given their date of birth. You need to select "date
of birth" in the "Search field" dropdown, or set it in
DefaultPatronSearchFields.

Note that the column filtering is still not working, but I guess it was
the case already in older versions. Ideally we will need to have a
"datatype" attribute passed to the the 'th' and retrieved from
datatables.js to add this same trick and build the query appropriately.

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>