[Bug]: The new Color Palette system cannot distinguish between original and previously modified Palettes

### Frontend Version

`v1.7.1`

### Expected Behavior

All Palettes are shown ( like in `v1.5.19` )


### Actual Behavior

The `Dark ( Default )` palette is not shown.

And custom palette, based on `Dark ( Default )`, is selected instead.

It seems that the new Color Palette system cannot distinguish between the original and the modified palettes.


### Steps to Reproduce

This custom palette was created before the Color Palette system was changed.
I'm not sure if it would work correctly, with a new custom palette.

The `Dark ( Default )` palette was exported, modified and imported back again, following these instructions:

- https://github.com/Comfy-Org/ComfyUI_frontend/pull/993#issuecomment-2391055076

### Debug Logs

```powershell
.
```

### Browser Logs

.

### Setting JSON

.

### What browsers do you use to access the UI ?

Google Chrome

### Other

_No response_

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-2153-Bug-The-new-Color-Palette-system-cannot-distinguish-between-original-and-previously-1716d73d3650815288bed1ecc97ee65f) by [Unito](https://www.unito.io)