chore(form): disable no-answer option for m/apreq forms

src/Utils/Form.hs

@@ -1667,7 +1667,8 @@ mpreq :: (RenderMessage site (ValueRequired site), HandlerSite m ~ site, MonadHa
 -- ^ Pseudo required
 --
 -- `FieldView` has `fvRequired` set to `True` and @FormSuccess Nothing@ is cast to `FormFailure`.
--- Otherwise acts exactly like `mopt`.
+-- Otherwise acts exactly like `mopt` without a default value and like `mreq` with a given default value
+mpreq f fs mx@(Just _) = mreq f fs mx -- This shortcut hides the invalid no-answer option if a default is provided
 mpreq f fs@FieldSettings{..} mx = do
   mr <- getMessageRender
   (res, fv') <- mpreq' f fs $ Just <$> mx