LCL/TDateEdit: Remove TCalendarPopupForm.Paint (not needed any more, and destroys dark mode in macOS). Issue #39930.

lcl/forms/calendarpopup.lfm

@@ -1,19 +1,18 @@
 object CalendarPopupForm: TCalendarPopupForm
   Left = 635
-  Height = 192
+  Height = 160
   Top = 259
-  Width = 233
+  Width = 176
   AutoSize = True
   BorderIcons = [biMinimize, biMaximize]
   BorderStyle = bsNone
   Caption = 'CalendarPopupForm'
-  ClientHeight = 192
-  ClientWidth = 233
+  ClientHeight = 160
+  ClientWidth = 176
   OnClose = FormClose
   OnCreate = FormCreate
   OnDeactivate = FormDeactivate
   PopupMode = pmAuto
-  LCLVersion = '2.1.0.0'
   object Calendar: TCalendar
     Left = 0
     Height = 160

lcl/forms/calendarpopup.pas

@@ -43,8 +43,6 @@ type
       AMinDate, AMaxDate: TDateTime);
     procedure KeepInView(const PopupOrigin: TPoint);
     procedure ReturnDate;
-  protected
-    procedure Paint; override;
   end;
 
 procedure ShowCalendarPopup(const APosition: TPoint; ADate: TDateTime;
@@ -192,12 +190,4 @@ begin
     Close;
 end;
 
-procedure TCalendarPopupForm.Paint;
-begin
-  inherited Paint;
-  Canvas.Pen.Color := clWindowText;
-  Canvas.Pen.Style := psSolid;
-  Canvas.Rectangle(0, 0, Width, Height);
-end;
-
 end.