Fix"Add" shortcut link in email address navigation (#1169)

Seems to have changed when adding the domain-filter overview for email addresses, but not updated in the navigation.

lib/navigation/00.froxlor.main.php

@@ -38,7 +38,7 @@
 					'url' => 'customer_email.php?page=emails',
 					'label' => lng('menue.email.emails'),
 					'required_resources' => 'emails',
-					'add_shortlink' => CurrentUser::canAddResource('emails') ? 'customer_email.php?page=emails&action=add' : null,
+					'add_shortlink' => CurrentUser::canAddResource('emails') ? 'customer_email.php?page=email_domain&action=add' : null,
 				],
 				[
 					'url' => Settings::Get('panel.webmail_url'),