Fixed login error where no error message was shown, now it does

Signed-off-by: rodude123 <rodude123@gmail.com>

src/api/index.php

@@ -405,6 +405,7 @@ $app->post("/user/login", function (Request $request, Response $response)
         $response->getBody()->write(json_encode(array("token" => $_SESSION["token"])));
         return $response;
     }
+    $response->getBody()->write(json_encode(array("error" => "Unauthorised")));
     return $response->withStatus(401);
 });