Bug 35309: Remove DT's fnSetFilteringDelay

Bug 35309: Remove DT's fnSetFilteringDelay

On bug 35284 we added the delay on the column filters using dt's
throttle builtin function.

From doc:
https://datatables.net/plug-ins/api/fnSetFilteringDelay
"""
Please note that this plug-in has been deprecated and the dt-init searchDelay option in DataTables 1.10 should now be used. This plug-in will not operate with v1.10+.

Test plan:
Note that column filtering still work as before (test on different
tables, see bug 35284 for the list)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>