Fix the problem of white viewport when calling the context menu in the RDP

[msergeev]

To date, there is a problem with the viewport of 3dmax in the RDP session with a right click (call the context menu)
the problem is only in the version of Windows 10 2004 20H1 and 20H2
in 1909 and earlier releases of Windows, the problem was not observed

When calling the context menu in the viewport, in the RDP session, the entire 3dmax interface is closed with a white background.