HasOwnerPermissions doesn't work as documented

[raburton]

HasOwnerPermissions only has an internal getter, but a public setter - presumably should be the other way around

PDFsharp/src/foundation/src/PDFsharp/src/PdfSharp/Pdf.Security/PdfSecuritySettings.cs

Lines 18 to 27 in 9c3863a

	/// <summary>
	/// Indicates whether the granted access to the document is 'owner permission'. Returns true if the document
	/// is unprotected or was opened with the owner password. Returns false if the document was opened with the
	/// user password.
	/// </summary>
	public bool HasOwnerPermissions
	{
	internal get => _hasOwnerPermissions;
	set => _hasOwnerPermissions = value;
	}