Fix syntax error in release Jenkinsfile

Signed-off-by: Alexander Dudaev <Aleksandr.Dudayev@xored.com>
diff --git a/releng/Jenkinsfile b/releng/Jenkinsfile
index 4cbbd3e..49ea239 100644
--- a/releng/Jenkinsfile
+++ b/releng/Jenkinsfile
@@ -4,7 +4,7 @@
   agent none
 
   parameters {
-    choice(name: 'MODE', choices: ['Release', 'Milestone'], description: 'The deploy mode'),
+    choice(name: 'MODE', choices: ['Release', 'Milestone'], description: 'The deploy mode')
     string(name: 'MILESTONE_VERSION', defaultValue: 'MO', description: 'Only for milestone build')
   }