适配 3.1.17 版

版本3.1.17 BuiId: 204416 Patch: 0b7c7b7 无法使用，表现为一直loading

应该是函数变了的问题，开个issue标记一下进度

```
music-corona.min.js:1 Uncaught TypeError: 函数 getPlaying 未找到
    at ws (eval at c (framework.js:4), <anonymous>:10:59858)
    at dc (eval at c (framework.js:4), <anonymous>:10:59944)
    at r (eval at c (framework.js:4), <anonymous>:83:34735)
    at t (music-corona.min.js:1)
```
