Remove useless anonymous subclass creation

src/main/java/sh/libre/scim/core/UserAdapter.java

@@ -228,8 +228,7 @@ public class UserAdapter extends Adapter<UserModel, User> {
 
     @Override
     public Stream<UserModel> getResourceStream() {
-        Map<String, String> params = new HashMap<>() {
-        };
+        Map<String, String> params = new HashMap<>();
         return this.session.users().searchForUserStream(realm, params);
     }