wxGUI: apply natural sort also when filtering data (merge from trunk, https://trac.osgeo.org/grass/changeset/68103)

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@68104 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/gui_core/dialogs.py

@@ -1481,7 +1481,8 @@ class MapLayersDialogBase(wx.Dialog):
                     list.append(layer)
             except:
                 pass
-        
+        list = natural_sort(list)
+
         self.layers.Set(list)
         self.OnSelectAll(None)