Option to remove the overlay colour during hover but keep the controls

In Flutter Web the mouse over overlay stays for 3 seconds and is a black54. I'd like to see an ability to remove it and just show the controls on hover. Currently the only way to do this is to wrap the control in a Theme that has the platform set to iOS:

```
final themeData = Theme.of(context);
return _chewieController != null && _chewieController!.videoPlayerController.value.isInitialized
? Theme(
data: themeData.copyWith(platform: TargetPlatform.iOS),
child: Chewie(
controller: _chewieController!,
),
)
: const Center(
child: CircularProgressIndicator(),
);
}
```