wxGUI: do not modify saved window layout

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@42248 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/wxgui.py

@@ -165,9 +165,10 @@ class GMFrame(wx.Frame):
                self.SetSize((w, h))
             except:
                 pass
+        else:
+            self.Centre()
         
         self.Layout()
-        self.Centre()
         self.Show()
         
         # load workspace file if requested