Login to view the article redirect fix (#20732)

Without the view=login parameter JRoute can not resolve the Itemid. 
So the menu item assigned to 'login' is not active.

Seems there is a related hack here:
/com_content/views/article/tmpl/default.php ~line 143

This can also cause problems with third party extensions like sh404sef.

components/com_content/views/article/view.html.php

@@ -150,7 +150,7 @@ public function display($tpl = null)
 			if ($this->user->get('guest'))
 			{
 				$return = base64_encode(JUri::getInstance());
-				$login_url_with_return = JRoute::_('index.php?option=com_users&return=' . $return);
+				$login_url_with_return = JRoute::_('index.php?option=com_users&view=login&return=' . $return);
 				$app->enqueueMessage(JText::_('JERROR_ALERTNOAUTHOR'), 'notice');
 				$app->redirect($login_url_with_return, 403);
 			}