[Feature Request]: Change Pin Icon

## Ref

- #120.
- Comfy-Org/ComfyUI_frontend#831

## Possible Implementation

The PrimeIcons font is already loaded with icons mapped to unicode sequences:

```javascript
ctx.textAlign = "left";
ctx.fillText(
title,
title_height,
LiteGraph.NODE_TITLE_TEXT_Y - title_height
);
if (node22.pinned) {
ctx.font = `${this.title_text_font.split(" ")[0]} PrimeIcons`
ctx.fillText(
"\uea25",
title_height + ctx.measureText(title).width + 8,
LiteGraph.NODE_TITLE_TEXT_Y - title_height
)
}
```

## Comparison