wxGUI/toolboxes: fix test

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@71864 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/core/toolboxes.py

@@ -419,7 +419,7 @@ def _expandToolboxes(node, toolboxes):
     ...   </toolbox>
     ... </toolboxes>''')
     >>> _expandToolboxes(menu, toolboxes)
-    >>> print etree.tostring(menu)
+    >>> print(etree.tostring(menu))
     <toolbox name="Raster">
       <label>&amp;Raster</label>
       <items>