removed seemingly obsolete property in AbstractTableInstanceWriter

Change-Id: I3f182d883f45ae6050b6e96b4364333832cde8ac
Reviewed-on: http://gerrit.esdi-community.eu/3188
Tested-by: Jenkins <sitemple@igd.fraunhofer.de>
Reviewed-by: Simon Templer <simon.templer@igd.fraunhofer.de>