fix expected module for opensaml

Author: rjernst

x-pack/plugin/security/src/main/plugin-metadata/entitlement-policy.yaml

@@ -17,6 +17,7 @@ org.opensaml.xmlsec.impl:
   - write_system_properties:
       properties:
         - org.apache.xml.security.ignoreLineBreaks
+org.opensaml.saml.impl:
   - files:
     - relative_path: idp-docs-metadata.xml
       relative_to: config