Remove "ED" suffix from EVT_DATAVIEW_COLUMN_HEADER_RIGHT_CLICKED.

Remove "ED" suffix from EVT_DATAVIEW_COLUMN_HEADER_RIGHT_CLICKED.

The naming of this macro was inconsistent with other similar macros in
wxListCtrl and wxTreeCtrl and even EVT_DATAVIEW_COLUMN_HEADER_CLICK in
wxDataViewCtrl itself. Moreover, it was even documented under the wrong name
without "ED".

Clear this mess by removing the "ED" suffix while still keeping the old macro
name for compatibility.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73823 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775