TCI - Add missing #layout-call to SimpleControlSWTRenderer

* we need to layout after we set the top-control of a stacklayout.
during initial rendering this is no issue, as parent renderers will
layout us. during runtime this layout call is important however

Change-Id: I4a27d9f2388ffd28f500e15689b36d5239d64352
Signed-off-by: Johannes Faltermeier <jfaltermeier@eclipsesource.com>