core: AddTemplate: Remove unused dest sd handling

Change-Id I523814cd3c1f64c1ae40624ba50f239f2cebaed7 removed the setting
of the destinationId in the constructor.
This left that variable unused, so it can safely be removed.

Change-Id: Id8440f9ece2fbe21c5bca6acde43d3a45ac2126a
Signed-off-by: Allon Mureinik <amureini@redhat.com>