Add the feature action to the permission checks (see contao#2524)

Description
-----------

| Q                | A
| -----------------| ---
| Fixed issues     | Fixes contao#2505
| Docs PR or issue | n/a

See contao#2505.

Commits
-------

6131435 Add feature action to permission check as well (see contao#2505)

calendar-bundle/src/Resources/contao/dca/tl_calendar_events.php

@@ -638,6 +638,7 @@ public function checkPermission()
 			case 'show':
 			case 'delete':
 			case 'toggle':
+			case 'feature':
 				$objCalendar = $this->Database->prepare("SELECT pid FROM tl_calendar_events WHERE id=?")
 											  ->limit(1)
 											  ->execute($id);