fix g.extension command for installing wx.psmap

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@45797 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/wxgui.py

@@ -273,7 +273,7 @@ class GMFrame(wx.Frame):
         except:
             gcmd.GError(parent = self.parent,
                         message = _("Hardcopy Map Output Utility is not available. You can install it by "
-                                    "'g.extension -s svnurl=https://svn.osgeo.org/grass/grass-addons extension=psmap'"))
+                                    "'g.extension -s svnurl=https://svn.osgeo.org/grass/grass-addons extension=wx.psmap'"))
             return
         
         win = psmap.PsMapFrame(parent = self)