Show help even for toolbars which aren't direct wxFrame children

Display "long help" text associated with the toolbar items in the status
bar of the parent frame even if the toolbar is not a direct child of the
frame.

Closes #17897.

src/common/tbarbase.cpp

@@ -674,7 +674,7 @@ void wxToolBarBase::OnMouseEnter(int toolid)
     event.SetEventObject(this);
     event.SetInt(toolid);
 
-    wxFrame *frame = wxDynamicCast(GetParent(), wxFrame);
+    wxFrame *frame = wxDynamicCast(wxGetTopLevelParent(this), wxFrame);
     if ( frame )
     {
         wxString help;