add mandatory fields for user update

test/user_test.exs

@@ -1131,6 +1131,8 @@ test "with overly long fields" do
 
       data = %{
         ap_id: user.ap_id,
+        name: user.name,
+        nickname: user.nickname,
         info: %{
           fields: [
             %{"name" => "myfield", "value" => String.duplicate("h", current_max_length + 1)}