`HasShadow` Is Not `true` by Default

[AeonSake]

The documentation of BrowserWindowOptions.HasShadow says it's true by default (mirroring what electron does). However, the class property does not force true by default and therefore gets serialized as false when creating a new window.

Electron.NET/src/ElectronNET.API/API/Entities/BrowserWindowOptions.cs

Lines 215 to 218 in c8268fa

	/// <summary>
	/// Whether window should have a shadow. Default is true.
	/// </summary>
	public bool HasShadow { get; set; }