标准模式下无用组件残余

[FLY0036]

描述问题

使用Apple Music播放时（不清楚其他播放源的情况）标准模式下（不清楚其他模式窗口的情况，在写此issue时触发issue#214）在右下角三个点右侧会存在一个透明的图标可以点击（推测是调音量的组件没删干净），每次点击后都出现百分比拖拽条值为-1%，拖拽后没有作出任何更改，建议修改成用来改系统音量的

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BetterLyrics 版本

v1.2.309.0

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Title: Remnants of useless components in standard mode

Describe the problem

When using Apple Music to play (not sure about other playback sources) in standard mode (not sure about other mode windows, issue #213 was triggered when writing this issue) there will be a transparent icon to the right of the three dots in the lower right corner that can be clicked (presumably the volume adjustment component has not been deleted). After each click, the percentage drag bar value appears to be -1%. No changes are made after dragging. It is recommended to change it to change the system volume.

Screenshot

BetterLyrics version

v1.2.309.0