Update CSS Map Icon

### Type

- [x] File icon
- [ ] Folder icon

### Context and associations

Update the CSS Map icon to use the modern logo, plus the map symbol. The file extension is `.css.map`

### References

https://github.com/catppuccin/vscode-icons/blob/main/icons/mocha/css-map.svg

But swap the shield out for https://github.com/catppuccin/vscode-icons/blob/main/icons/mocha/css.svg