Fix privilege FTR

Author: efegurkan

x-pack/test/api_integration/apis/security/privileges_basic.ts

@@ -151,7 +151,6 @@ export default function ({ getService }: FtrProviderContext) {
             slo: ['all', 'read', 'minimal_all', 'minimal_read'],
             searchPlayground: ['all', 'read', 'minimal_all', 'minimal_read'],
             searchInferenceEndpoints: ['all', 'read', 'minimal_all', 'minimal_read'],
-            searchSynonyms: ['all', 'read', 'minimal_all', 'minimal_read'],
             fleetv2: [
               'agent_policies_all',
               'agent_policies_read',