fix broken quality template

package.json

@@ -1,6 +1,6 @@
 {
   "name": "dplayer",
-  "version": "1.22.0",
+  "version": "1.22.1",
   "description": "Wow, such a lovely HTML5 danmaku video player",
   "main": "dist/DPlayer.min.js",
   "style": "dist/DPlayer.min.css",

src/template/player.art

@@ -102,7 +102,7 @@
         <div class="dplayer-quality">
             <button class="dplayer-icon dplayer-quality-icon">{{ options.video.quality[options.video.defaultQuality].name }}</button>
             <div class="dplayer-quality-mask">
-                <div class="dplayer-quality-list"></div>
+                <div class="dplayer-quality-list">
                 {{ each options.video.quality }}
                     <div class="dplayer-quality-item" data-index="{{ $index }}">{{ $value.name }}</div>
                 {{ /each }}