wxGUI: remove unused import

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@58421 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/vdigit/mapwindow.py

@@ -28,7 +28,6 @@ from core.utils     import ListOfCatsToRange, _
 from core.globalvar import QUERYLAYER
 from vdigit.dialogs import VDigitCategoryDialog, VDigitZBulkDialog, VDigitDuplicatesDialog
 from gui_core       import gselect
-from vdigit.wxdigit import GV_CENTROID
 
 class VDigitWindow(BufferedMapWindow):
     """!A Buffered window extended for vector digitizer.