Make #scrollbar-track color the same as 1.1.19 progress bar

[Palloxin]

Describe your suggested feature

https://github.com/LNReader/lnreader/blob/master/android/app/src/main/assets/css/index.css#L188

This track bar color. Beta:

1.1.19:

Make beta track bar color (light and dark mode) the same as in 1.1.19 stable.

Why

It's better looking.

Other details

The color is probably the same as the placeholder in customCSS (it uses onSurface) Dark:

Light:

Acknowledgements

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• [X] I have updated the app to version 2.0.0.
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