Make sure client rectangle is the correct width so we don't get a blank spot to the right of the header image because our wxWidgets border calculation is sometimes wrong.

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@6463 212acab6-be3b-0410-9dea-997c60f758d6

Contrib/NSIS Menu/nsismenu/nsismenu.cpp

@@ -110,6 +110,7 @@ private:
    
      // Show it and tell the application that it's our main window
 
+     frame->SetClientSize(HTMLW, HTMLH);
      frame->Show(TRUE);
      SetTopWindow(frame);