Updated flow to ensure /register/confirm route is used where needed

Was accidentally skipped during previous updates. Will now be used on
saml, ldap & standard registration where required.
Uses session to know if the email was just sent and, if so, show the
confirmation route.

app/Http/Middleware/Authenticate.php

@@ -44,6 +44,10 @@ class Authenticate
             ], 401);
         }
 
+        if (session()->get('sent-email-confirmation') === true) {
+            return redirect('/register/confirm');
+        }
+
         return redirect('/register/confirm/awaiting');
     }
 }