fix(InterfaceField): add missing _vip prefix to carp ifs

The _vip prefix was not be properly applied to InterfaceField values allowing carp interfaces. This commit ensures the proper prefix is present when identifying available carp choices.

Author: jaredhendrickson13

pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Fields/InterfaceField.inc

@@ -219,7 +219,8 @@ class InterfaceField extends StringField {
             foreach ($virtual_ips as $virtual_ip) {
                 # Only include CARP virtual iPs with unique IDs
                 if ($virtual_ip['mode'] === 'carp' and $virtual_ip['uniqid']) {
-                    $choices[$virtual_ip['uniqid']] = $virtual_ip['uniqid'];
+                    $uniqid = "_vip".$virtual_ip['uniqid'];
+                    $choices[$uniqid] = $uniqid;
                 }
             }
         }