wxGUI: fix https://trac.osgeo.org/grass/changeset/52335 (patch provided by Stepan Turek)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@52351 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/mapdisp/frame.py

@@ -1329,7 +1329,7 @@ class MapFrame(SingleMapFrame):
         if self.dialogs['vnet']:
             return
         else:
-            from vnet.dialog import VNETDialog
+            from vnet.dialogs import VNETDialog
             self.dialogs['vnet'] = VNETDialog(parent = self)
             self.dialogs['vnet'].CenterOnScreen()
             self.dialogs['vnet'].Show()