remove script after execution

lib/single-file/font-face-proxy.js

@@ -9,6 +9,7 @@ this.fontFaceProxy = this.fontFaceProxy || (() => {
 		const scriptElement = document.createElement("script");
 		scriptElement.textContent = `(${hook.toString()})()`;
 		document.documentElement.appendChild(scriptElement);
+		scriptElement.remove();
 		addEventListener("single-file-font-face", event => fontFaces.push(event.detail));
 	}