Update response body in futures unit test

Author: AndrewFerr

spec/unit/matrixrtc/MatrixRTCSession.spec.ts

@@ -258,10 +258,7 @@ describe("MatrixRTCSession", () => {
                 sendStateFutureMock = jest.fn(() => {
                     resolve();
                     return {
-                        future_group_id: "g",
-                        send_token: "s",
-                        cancel_token: "c",
-                        refresh_token: "r",
+                        future_id: "f",
                     };
                 });
             });
@@ -393,10 +390,7 @@ describe("MatrixRTCSession", () => {
                 sendStateFutureMock = jest.fn(() => {
                     resolve();
                     return {
-                        future_group_id: "g",
-                        send_token: "s",
-                        cancel_token: "c",
-                        refresh_token: "r",
+                        future_id: "f",
                     };
                 });
             });