Always use native task dialog for wxProgressDialog under MSW if supported.

Always use native task dialog for wxProgressDialog under MSW if supported.

Use task dialogs even for the dialogs with wxPD_AUTO_HIDE style flag and
without wxPD_CAN_ABORT one. Generic fallback was used in this case as native
task dialog doesn't support dialogs without buttons but it is finally better
to create a dummy button and use the native dialog nevertheless. We already
have a mostly disabled "Close" button for the dialogs without wxPD_AUTO_HIDE
style so it seems logical to also have it (but just never enable it at all)
when this style is used.

Closes #12462.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65574 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775