servoshell: Flip width and height to correct order - #46477

fn request_resize(&self, _: &WebView, new_outer_size: DeviceIntSize) -> Option<DeviceIntSize> {
        ...
        let decoration_size: DeviceIntSize = Size2D::new(
            outer_size.height - inner_size.height,
            outer_size.width - inner_size.width,
        )
        .cast();

/// A 2d size tagged with a unit.
#[repr(C)]
pub struct Size2D<T, U> {
    /// The extent of the element in the `U` units along the `x` axis (usually horizontal).
    pub width: T,
    /// The extent of the element in the `U` units along the `y` axis (usually vertical).
    pub height: T,
    #[doc(hidden)]
    pub _unit: PhantomData<U>,
}