wxGUI: add missing import

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@61548 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/gui_core/widgets.py

@@ -42,6 +42,7 @@ This program is free software under the GNU General Public License
 import os
 import sys
 import string
+import re
 
 import wx
 import wx.lib.mixins.listctrl as listmix