Custom colors for node title bar not loading anymore after Update 0.3.75

### Custom Node Testing

- [x] I have tried disabling custom nodes and the issue persists (see [how to disable custom nodes](https://docs.comfy.org/troubleshooting/custom-node-issues#step-1%3A-test-with-all-custom-nodes-disabled) if you need help)

### Expected Behavior

Custom Title-Bar colors from the JSON should be applied to the nodes.

### Actual Behavior

Custom title bar node colors are not loading anymore.

### Steps to Reproduce

1. Create a workflow with nodes using Align plugin and custom Title-Bar colors.
2. Save workflow.
3. Load workflow in ComfyUI → observe all nodes display the default "no color".

### Debug Logs

```powershell
No output to console available.
```

### Other

The JSON for workflows still contains custom "color" / "bgcolor" values for nodes (e.g., from the Align plugin), but when loading the workflow in ComfyUI 0.3.75, all nodes display only the default color. The Title-Bar colors are completely ignored, despite being correctly set in the JSON. This worked in previous versions until now. It has nothign to do with the frontend package, because ive updated this later. The reason why i've posted this here. The workflow looking very boring now. I dont know if this is a bug or a feature! I hope only a bug...