GHOST/WIN32: Remove Initial UpdateWindow

We call UpdateWindow very early in our window creation, before we get
an openGl surface and before our message queue is ready. This results
in WM_ACTIVATE, WM_SIZE, WM_MOVE, and WM_PAINT messages sent to us
at a time when GetMessageTime() returns zero. This makes our event
message times have a gap between the fourth and fifth messages, equal
to the time since system start. There is no downside to not calling
this at this time.

Pull Request: https://projects.blender.org/blender/blender/pulls/117965

intern/ghost/intern/GHOST_WindowWin32.cc

@@ -221,9 +221,6 @@ GHOST_WindowWin32::GHOST_WindowWin32(GHOST_SystemWin32 *system,
   }
 #endif
 
-  /* Force an initial paint of the window. */
-  ::UpdateWindow(m_hWnd);
-
   /* Initialize WINTAB. */
   if (system->getTabletAPI() != GHOST_kTabletWinPointer) {
     loadWintab(GHOST_kWindowStateMinimized != state);