Emulate a 1-pixel pen width as closely as possible. This reverts:334cf1cc91
(Take HiDPI scale into account for wxGCDC 0-width pen, 2021-04-03)0d80050057
(Make wxGCDC behavior with 0-width wxPen consistent with MSW wxDC, 2021-03-02) See #19077, #19115