Fix for drawing check box in the wxPG edit mode when RTL layout direction is set under wxMSW.

Check box isn't drawn correctly in the edit mode under wxMSW due to the problems with RTL handling in wxAutoBufferedPaintDC and wxPaintDC (see #16254).
We need to only draw the image, no text, so we can work around the problem by overriding layout direction to LTR.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76932 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775