Refactoring TTaskDialog: remove property ParentWindow (added in 61fefaa7), it's not longer needed.

lcl/dialogs.pp

@@ -629,7 +629,6 @@ type
     FFooterText: TTranslateString;
     FMainIcon: TTaskDialogIcon;
     FModalResult: TModalResult;
-    FParentWindow: HWND;
     FRadioButton: TTaskDialogRadioButtonItem;
     FRadioButtons: TTaskDialogButtons;
     FText: TTranslateString;
@@ -648,9 +647,6 @@ type
   public
     FWidth: Integer; //ToDo: make this a readonly property, so we can use it in the TaskDlgEmulation unit.
 
-
-    property ParentWindow: HWND read FParentWindow;
-
     constructor Create(AOwner: TComponent); override;
     destructor Destroy; override;
     function Execute: Boolean; overload; dynamic;

lcl/include/taskdialog.inc

@@ -228,7 +228,6 @@ const
 begin
   //Current goal of refactoring: replace all this with:
   //Result := TWSTaskDialogClass(WidgetSetClass).Execute(Self);
-  FParentWindow := ParentWnd;
 
 
   //temporary show new, then old dialog, both in emulated mode (regardless of Flags)