Modernizing inline script tags for templates & JS API

So I’ve slapped my tiny “make-avatar-bigger” script into the JS tab (out of Desktop - <head> ), and that works simply enough, but is there at least a quick ‘n dirty way to keep it only applying in Desktop? My mobile avatars are also now large and it all looks rather silly.

The code for ref is:

import { apiInitializer } from "discourse/lib/api";

export default apiInitializer((api) => {
 api.changeWidgetSetting('post-avatar', 'size', '70');
});