[SHIBUI-906]

A little more groovy cleanup.

backend/src/test/groovy/edu/internet2/tier/shibboleth/admin/ui/repository/MetadataResolverRepositoryTests.groovy

@@ -79,9 +79,7 @@ class MetadataResolverRepositoryTests extends Specification {
             it.name = 'original'
             it.resourceId = 'new-filter-UUID'
             it.attributeRelease = ['attr-for-release']
-            def overrides = [:]
-            overrides["signAssertion"] = true
-            it.setRelyingPartyOverrides(overrides) // to make sure it.rebuildAttributes() is called
+            it.setRelyingPartyOverrides(['signAssertion': true]) // to make sure it.rebuildAttributes() is called
             it
         }
         MetadataResolver metadataResolver = metadataResolverRepository.findAll().iterator().next()