call SetEventObject() for wxHtmlLinkEvents we generate [backport from HEAD]

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@45244 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/html/htmlwin.cpp

@@ -953,6 +953,7 @@ bool wxHtmlWindow::CopySelection(ClipboardType t)
 void wxHtmlWindow::OnLinkClicked(const wxHtmlLinkInfo& link)
 {
     wxHtmlLinkEvent event(GetId(), link);
+    event.SetEventObject(this);
     if (!GetEventHandler()->ProcessEvent(event))
     {
         // the default behaviour is to load the URL in this window