message: fix tests for the new sessionStorage key
diff: @@ -220,7 +220,7 @@ describe('<SendMessageComposer/>', () => {
  });
  expect(wrapper.text()).toBe("");
  - const str = sessionStorage.getItem(`mx_cider_composer_history_${mockRoom.roomId}[0]`);
  + const str = sessionStorage.getItem(`mx_cider_history_${mockRoom.roomId}[0]`);
  expect(JSON.parse(str)).toStrictEqual({
  parts: [{"type": "plain", "text": "This is a message"}],
  replyEventId: mockEvent.getId(),
  