Fix a hls bug when switching quality

[wangcheng]

Pull Request Template

Description

使用 hls 插件的时候，外层不应该处理 src 改变的事件。

所以改变了一下插件的结构，这样 Video 判断是否需要跳过 src 改变时的相关逻辑

Fixes #50

How Has This Been Tested?

• hls 可以播放，可以切换清晰度
• 其他模式正常

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[codecov-io]

Codecov Report

Merging #59 into master will decrease coverage by 0.09%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master      #59     +/-   ##
=========================================
- Coverage    52.2%   52.11%   -0.1%     
=========================================
  Files         123      123             
  Lines        1699     1702      +3     
=========================================
  Hits          887      887             
- Misses        812      815      +3

Impacted Files	Coverage Δ
...kages/griffith/src/components/Video/NormalVideo.js	0% <0%> (ø)	⬆️
packages/griffith/src/components/Video/Video.js	0% <0%> (ø)	⬆️
packages/griffith-hls/src/Video.js	0% <0%> (ø)	⬆️

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