Swicthed back to original way of using AddToStackL and RemoveFromStack

Task: 258504

This commit fixes the problem that background widgets do not get
orientation change events, and thus will not be correctly layouted after
the foreground windget is closed.

See also: c17c1c101cbe09d4c6149ef8e76a9bb792222456

At the time when commit c17c1c101cbe09d4c6149ef8e76a9bb792222456 was
created there were no SetFocus calls in hide_sys and show_sys.
I think that has been the root cause why focus change event has not
been generated. I.e. hiding a CCoeControl in Symbian (MakeVisible)
does not generate focus event but setFocus(false/true) generates.

I tried this code with Drilldown example. In city detaisl view the
combobox was working fine with keypad navigation.

The change had no effects to qcombobox autotest results and qwidget
autotest resutls were better on some run and a bit worse on some run.
There was variation in 2-4 qwidget autotest results on each run.
Note also that screensaver seems to affect to test results.

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