When drawing wxPG items (with double buffering) use the same layout direction as the window uses.

Memory DC used for double buffering purposes should inherit layout direction from the window DC to ensure that texts are rendered correctly.

Closes #15797.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76931 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775