Bug 36392: (bug 34219 follow-up) Fix getAll for vendors - ERM

Bug 36392: (bug 34219 follow-up) Fix getAll for vendors - ERM

In commit f1078daf8f496e1b4234acf766578c511ca8aad1
   Bug 34219: Allow getAll to receive additional URL parameters

We needed to call getAll instead of get to fetch all the vendors

Test plan:
Have more than 20 vendors and create/edit an agreement.
Notice that the vendor list contains all the vendors

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Matthias Le Gac <matthias.le-gac@inlibro.com>
Signed-off-by: Pedro Amorim <pedro.amorim@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 17b134fcb982768541b66f327ba301e06a727337)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>