Support for prefers-color-scheme media query

[TeddyDD]

I've been testing Wails v2 on Linux (webkitgtk), it seems it does not support dark theme media query

@media (prefers-color-scheme: dark) {
...
}

It this feature supported on other platforms? Are there plans to add support for it on Linux?

[leaanthony]

This provides more context: https://bugs.chromium.org/p/chromium/issues/detail?id=998903