Fix undefined string_value parameter in galera restore pipe

Fixes: PROD-29417

Change-Id: I239c278c730751623e95a1c020127778a34ca560
diff --git a/galera-cluster-verify-restore.groovy b/galera-cluster-verify-restore.groovy
index 2e42509..054c0cc 100644
--- a/galera-cluster-verify-restore.groovy
+++ b/galera-cluster-verify-restore.groovy
@@ -91,9 +91,9 @@
             stage('Backup') {
                 common.infoMsg("Running backup job.")
                 deployBuild = build( job: "galera-database-backup-pipeline", parameters: [
-                    [$class: string_value, name: 'SALT_MASTER_URL', value: SALT_MASTER_URL],
-                    [$class: string_value, name: 'SALT_MASTER_CREDENTIALS', value: SALT_MASTER_CREDENTIALS],
-                    [$class: string_value, name: 'OVERRIDE_BACKUP_NODE', value: "none"],
+                    [$class: 'StringParameterValue', name: 'SALT_MASTER_URL', value: SALT_MASTER_URL],
+                    [$class: 'StringParameterValue', name: 'SALT_MASTER_CREDENTIALS', value: SALT_MASTER_CREDENTIALS],
+                    [$class: 'StringParameterValue', name: 'OVERRIDE_BACKUP_NODE', value: "none"],
                     ]
                 )
             }