Error when using "Picture in Picture".

[HyunjoonKo]

Environment: Xcode 12.4 (12D4e)
Language: Swift 5.3.2
Toaster version used: 2.3.0

When using the "Picture in Picture" function on iOS 14 or higher devices, the toast view is not in the normal position.

Error reproduction path:

1. Launch the video player(AVPlayer) and activate the PIP mode.
2. Change the device orientation to landscape mode.
3. Change the orientation back to portrait.

• An error occurred.

When an error occurs, the toast is output in a strange position, regardless of the device's orientation portrait/landscape.

Looking at the code, let containerSize = ToastWindow.shared.frame.size in ToastView's layoutSubviews() is wrong. Originally it should be the device screen size, but it seems to be returned as the size of AVLayer of AVPictureInPictureController.