Also fill the column for wxEVT_DATAVIEW_ITEM_ACTIVATED in wxOSX

Similar to the previous commit.

Closes https://github.com/wxWidgets/wxWidgets/pull/967

docs/changes.txt

@@ -160,6 +160,7 @@ wxOSX:
 - Implement wxDataViewColumn::UnsetAsSortKey() (Daniel Kulp).
 - supporting native image formst like NSImage and UIImage in wxBitmap
 - native implementation for wxStaticBitmap for correct rendering of template images
+- Fill column value in wxEVT_DATAVIEW_ITEM_ACTIVATED events (Igor Korot).
 
 wxQt:
 

src/osx/cocoa/dataview.mm

@@ -1657,6 +1657,7 @@ outlineView:(NSOutlineView*)outlineView
 
     const wxDataViewItem item = wxDataViewItemFromItem([self itemAtRow:[self clickedRow]]);
     wxDataViewEvent event(wxEVT_DATAVIEW_ITEM_ACTIVATED, dvc, item);
+    event.SetColumn( [self clickedColumn] );
     dvc->GetEventHandler()->ProcessEvent(event);
 }