Update mock

Author: AndrewFerr

spec/unit/embedded.spec.ts

@@ -60,7 +60,7 @@ class MockWidgetApi extends EventEmitter {
     public requestCapabilityToSendToDevice = jest.fn();
     public requestCapabilityToReceiveToDevice = jest.fn();
     public sendRoomEvent = jest.fn(() => ({ event_id: `$${Math.random()}` }));
-    public sendStateEvent = jest.fn();
+    public sendStateEvent = jest.fn(() => ({ event_id: `$${Math.random()}` }));
     public sendToDevice = jest.fn();
     public requestOpenIDConnectToken = jest.fn(() => {
         return testOIDCToken;