add scrollbar to the music list - bugfix for oc-301

apps/media/css/music.css

@@ -22,6 +22,7 @@ div.jp-volume-bar-value { background:#ccc; width:0; height:0.4em; }
 #leftcontent img.remove { display:none; float:right; cursor:pointer; opacity: 0; }
 #leftcontent li:hover img.remove { display:inline; opacity: .3; }
 #leftcontent li div.label { float: left; width: 200px; overflow: hidden; text-overflow: ellipsis; }
+#rightcontent { overflow: auto; }
 #playlist li { list-style-type:none; }
 .template { display:none; }
 .collection_playing { background:#eee; font-weight: bold; }