Always set the font to use in wxMSW wxTextMeasure when using a window.

Always set the font to use in wxMSW wxTextMeasure when using a window.

The default window HDC font is not the same as the wxWindow font, so we need
to always set the font explicitly in this case (when using a wxDC, its HDC
does have the current wxDC font already selected into it, so doing it once
again would be unnecessarily wasteful).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72845 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775