Bug 37615: Clean up the form for sending cardnumbers from a report to batch patron...

Bug 37615: Clean up the form for sending cardnumbers from a report to batch patron modification

Since bug 37197 switched reports back to using a POST to send cardnumbers to
batch modification, we should also be using a single textarea rather than
multiple inputs.

Test plan:
1. Reports - Create from SQL - give it a name, and the SQL
   select cardnumber from borrowers limit 3
2. Save report - Run report
3. Batch operations with 3 visible records - Batch patron modification
4. Verify that you have the same three cardnumbers in Batch patron modification
   as were in the report.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>