wxGUI/layertree: fix broken drag and drop in https://trac.osgeo.org/grass/changeset/52913

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@52932 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/lmgr/layertree.py

@@ -1216,6 +1216,7 @@ class LayerTree(treemixin.DragAndDrop, CT.CustomTreeCtrl):
             self.hitCheckbox = True
         else:
             self.hitCheckbox = False
+        event.Skip()
         
     def OnChangingSel(self, event):
         """!Selection is changing.