wxNviz: fix drawing of north arrow (the same problem as fringe)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@47007 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/gui_modules/nviz_mapdisp.py

@@ -469,6 +469,8 @@ class GLWindow(MapWindow, glcanvas.GLCanvas):
         # on some computers
         if self.render['quick'] is False:
             self._display.DrawFringe()
+            if self.decoration['arrow']['show']:
+                self._display.DrawArrow()
         
         stop = time.clock()