[csrss]

- Route unhandled messages to DefWndProc, as it's usually done for every window proc.

svn path=/trunk/; revision=43935

reactos/subsystems/win32/csrss/win32csr/desktopbg.c

@@ -110,6 +110,9 @@ DtbgWindowProc(HWND Wnd, UINT Msg, WPARAM wParam, LPARAM lParam)
             return 0;
         }
       }
+
+      default:
+        return DefWindowProcW(Wnd, Msg, wParam, lParam);
     }
 
   return 0;