Fix chart.js support for SeaMonkey (#7816)

SeaMonkey support was broken by #7752 

Reproduce JS file:
```bash
git clone https://github.com/chartjs/Chart.js && \
cd Chart.js && \
git checkout tags/v4.5.0 && \
sed -i 's/es2022/es2021/g' rollup.config.js && \
pnpm install && \
pnpm run build && \
sha256sum dist/chart.umd.min.js
# SHA256 of dist/chart.umd.min.js should be: 311a5a5e0db077a787b782977f359a72f8584f94d800e324dcc6aefe8a006dd7
```