Bug 37343: Fixed search for vendors when transferring an item in acquistions

To test:
1. Have several vendors in acquistions
2. Add a basket and click "+Add to basket"
3. I used an mrc file to add an order from a new file
4. Stage for import -> add staged files to basket
5. Select the items and choose an item type
6. In the Orders table click 'Transfer' under the 'Modify' column
7. Try searching for vendors, nothing happens.
8. Apply patch restart_all
9. Click 'Transfer' again and try searching for vendors.
10. Notice vendors appear

NOTE:
Vendor search is a GET operation not POST. Use 'do_search' instead of 'cud-do_search'.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 54575f3c30)
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>

acqui/transferorder.pl

@@ -117,7 +117,7 @@ if( $basketno && $ordernumber) {
 } else {
     # Search for booksellers to transfer from/to
     $op = '' unless $op;
-    if( $op eq "cud-do_search" ) {
+    if( $op eq "do_search" ) {
         my $booksellers = Koha::Acquisition::Booksellers->search(
                             { name     => { -like => "%$query%" } },
                             { order_by => { -asc => 'name' } } );