[Extrametadataloader] Use Seperated icon for sound muted / not muted in the player controls

[joyrider3774]

Extension Extrametadataloader

Describe the solution you'd like To make the audio enable / disable icon in the player controls switch between an icon that indicaties if sound is muted or not muted instead of the single icon it uses now, it hard to tell if sound is enabled or not when clicking it and my video happens to have no sound or so. So basically switch icons whenever we click on the icon from muted (current icon) to a not muted icon (without the line through the icon for example)

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