Bug 34206: Fix display of vendor options in agreements and licenses forms

Bug 34206: Fix display of vendor options in agreements and licenses forms

Test plan:
1) Go to ERM licenses /cgi-bin/koha/erm/licenses
2) Click 'New license' and click the 'vendor' dropdown
3) Notice how it doesn't bring up any options
4) Apply patch and repeat test plan. Notice how now the vendor options show.
5) Repeat test plan for agreements

The test plan should be done using the 22.11.x branch

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>