UI Bug: The demo starts playing in the middle of the cutscene playback

[rauba-code]

Scope:

The bug was detected in both the v1.4.0-pre-release build and the latest commit on master (e3e5012).

This only matters when the cutscene is launched from the Media Room in the Main Menu. This bug was not detected when playing an introduction cutscene when launching the game without progress data.

Steps to reproduce:

1. Run taisei;
2. Go to Media Room;
3. Go to Replay Cutscenes;
4. Select any cutscene to replay;
5. Do not press any key on the keyboard for some time.

Expected output:

The demo does not playback during the replay cutscene playback.

Actual output:

The demo starts playing in the middle of the replay cutscene playback.