Show a different icon when already listening.

Closes #544

src/main.js

@@ -10,6 +10,7 @@ import {
     faHeadphones,
     faRss,
     faChevronLeft,
+    faTv,
 } from "@fortawesome/free-solid-svg-icons";
 import { faGithub, faBitcoin, faYoutube } from "@fortawesome/free-brands-svg-icons";
 import { FontAwesomeIcon } from "@fortawesome/vue-fontawesome";
@@ -26,6 +27,7 @@ library.add(
     faYoutube,
     faRss,
     faChevronLeft,
+    faTv,
 );
 
 import("uikit/dist/css/uikit-core.css");