fix error message for password reset request

src/Controller/LoginController.php

@@ -196,7 +196,7 @@ class LoginController
         if ($user === null) {
             return new JsonContent([
                 'error' => [
-                    'errorText' => 'No user found with the given email address / username.'
+                    'errorText' => 'No user found with the given email address.'
                 ]
             ]);
         }