fix: sync dock toggles and make autoplay toolbar-only

src/util/icon.hpp

@@ -24,6 +24,7 @@ namespace Icon
     inline QIcon previous()   { return get("media-skip-backward"); }
     inline QIcon shuffle()    { return get("media-playlist-shuffle"); }
     inline QIcon repeat()     { return get("media-playlist-repeat"); }
+    inline QIcon autoplay()   { return get("media-track-show-active"); }
 
     // Volume
     inline QIcon volumeHigh() { return get("audio-volume-high"); }