Fix Jenkins credentials state

Change-Id: I05a9cc5385769754a6c72dfdb751207891d4b73c
diff --git a/_states/jenkins_credential.py b/_states/jenkins_credential.py
index 93e559b..23653fa 100644
--- a/_states/jenkins_credential.py
+++ b/_states/jenkins_credential.py
@@ -40,7 +40,7 @@
     // remove credentails with same if before created new one, if exists
     def existingCreds = com.cloudbees.plugins.credentials.CredentialsProvider.lookupCredentials(
         com.cloudbees.plugins.credentials.common.StandardUsernameCredentials.class,
-        Jenkins.instance).find{it -> it.id.equals("{name}")}
+        Jenkins.instance).find{{it -> it.id.equals("{name}")}}
     if(existingCreds){{
         store.removeCredentials(domain, existingCreds)
     }}