Bug 34917: Fix default sort column of table in suggestion.tt

Bug 34917: Fix default sort column of table in suggestion.tt

Test plan:
1. Navigate to Acquisitions and load the suggestions management page
2. Ensure that there are some suggestions in the table
3. Observe that the default sort is on the "Suggester Category" column
4. Apply Patch
5. Observe that the default sort is now on the "Suggested on" column
   instead

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>