message: Fix 'state_key' field name.
diff: @@ -349,7 +349,7 @@ function setWidget(event, roomId) {
  userWidgets[widgetId] = {
  content: content,
  sender: client.getUserId(),
  - stateKey: widgetId,
  + state_key: widgetId,
  type: 'm.widget',
  id: widgetId,
  };
  