Bug 32491: Split patron search terms on comma

Bug 32491: Split patron search terms on comma

Previous behaviour allowed search 'surname, firstname'. We should remove
the comma from the search terms.

Test plan:
On the main patron search, search for "surname, firstname" and confirm
that with this patch applied the search returns the expected results.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>