Make the audio level in audio applet clearer

Tanbir Jishan requested to merge tantalising/plasma-pa:audio_slider_level into master

the current audio applet doesn't highlight the part before the handle unlike traditional sliders. The level volume is therefore not easy to infer visually. Still we cannot use the breeze blue color for highlight since it is used as a kind of audio visualizer in the slider. This MR tries to solve that by adding a different highlight. audio_level.mkv

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