fixup! add sortOrder capability for identity

Author: sherlockvn

lib/jmap/identities/get/get_identity_method.dart

@@ -29,7 +29,7 @@ class GetIdentityMethod extends GetMethod {
   Set<CapabilityIdentifier> get requiredCapabilitiesSupportSortOrder => {
     CapabilityIdentifier.jmapCore,
     CapabilityIdentifier.jmapSubmission,
-    CapabilityIdentifier.jmapSortOrder
+    CapabilityIdentifier.jamesSortOrder
   };
 
   @override