Bug 34522: Pass the suggestion branchcode, not the suggester branchcode

Bug 34522: Pass the suggestion branchcode, not the suggester branchcode

To test:
1. Turn on OPACViewOthersSuggestions
2. Log into OPAC as patron of Branch A
3. Make purchase suggestion for Branch B
4. Refresh /cgi-bin/koha/opac-suggestions.pl and see that suggestion appears to have been made for Branch A
5. View suggestion from staff client - See that it accurately reflects suggestion having been made for Branch B
6. Apply patch and try steps 2 - 5 again, this time you should see the proper branch.

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