ProgressCircle color does not follow MacosTheme

[adiletcool]

Description

ProgressCircle is not visible when using light theme

Steps To Reproduce

1. Specify MacosApp(themeMode: ThemeMode.light)
2. Create simple ProgressCircle() without value.

Expected behavior

class ProgressCircle extends StatelessWidget {
    ...

  @override
  Widget build(BuildContext context) {
    if (isDeterminate) {
        ...
    } else {
      return Semantics(
        label: semanticLabel,
        child: c.CupertinoActivityIndicator(
          radius: radius,
          color: MacosTheme.of(context).primaryColor, // should use primary color or color specified in parameters
        ),
      );
    }
}

[adiletcool]

Not sure about primaryColor, maybe it should be same as other icons color.

[Adrian-Samoticha]

This might be related (assuming the issue only persists when the light theme is set explicitly): https://github.com/macosui/macos_ui/issues/552

[petrockblog]

I am observing the same. Even though PR #552 is already closed, this behaviour is still observable. E.g.: