Pressing ESC Key while Dragging Freezes Track in Place

### Bug description

If the User drags a clip along the timeline and then presses Esc key to quit the dragging operation, the track will freeze in place.

### Steps to reproduce

1. Launch AU4
2. Create a new project
3. Generate a new clip into a track
4. Start dragging a clip
5. Press 'Esc'
6. Try moving the cursor
7. Observe the result

### Expected behavior

The operation should be canceled, the cursor and the clip are disengaged.

### Actual behavior

The operation is not 'canceled', the clip is still shown as if it's being moved along the timeline.

### Audacity Version

e0781101775d95947c33dec494cca84bcddd2005

### Operating system

OS independent

### Additional context

https://github.com/user-attachments/assets/d11d1946-e372-45b0-8146-80d9cd5a73f7