[FIX] Update ticket create form to hide contracts from other thirdpar…

…ties for external users (#31762)

Co-authored-by: fhoedl <florian@hoedl.co>

htdocs/core/class/html.formticket.class.php

@@ -769,7 +769,8 @@ function(response) {
 				$formcontract = new FormContract($this->db);
 				print '<tr><td><label for="contract"><span class="">'.$langs->trans("Contract").'</span></label></td><td>';
 				print img_picto('', 'contract', 'class="pictofixedwidth"');
-				print $formcontract->select_contract(-1, GETPOSTINT('contactid'), 'contractid', 0, 1, 1, 1);
+				// socid is for internal users null and not 0 or -1
+				print $formcontract->select_contract($user->socid ?? -1, GETPOSTINT('contactid'), 'contractid', 0, 1, 1, 1);
 				print '</td></tr>';
 			}
 		}