Change b86d0b6215 rearranged the
sequence of function calls when generating code adding QTabWidget
and QToolBox pages, not taking into account that the iconCall()
has a side effect (writing out icon definition) Revert that part
and add a comment.
Fixes: QTBUG-72980
Task-number: PYSIDE-797
Change-Id: Ie8fbaa36f21cd4408fb1f491195da5c260708e6c
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>