修复录屏无法播放的问题

Web/html/body/bilibili/video.html

@@ -108,7 +108,7 @@
                             stashInitialSize: 512 * 1024,
                             enableStashBuffer: true
                         }
-                        let playType = 'flv'
+                        let playType = 'mp4'
                         if (url.indexOf('_ffmpeg') !== -1) {
                             playType = 'mp4'
                         }