Fix printing multiple copies in wxMSW.

Fix printing multiple copies in wxMSW.

If wxPrinterDC was created by the native "Print" dialog for a printer that
supports printing multiple copies, we must not manually print multiple copies
ourselves as this results in too many copies being printed. However we still
need to loop explicitly for wxPrinterDC objects created manually or for the
printers without support for multiple copies (supposing they still exist).

Closes #10323.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74055 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775