[cleanup] Remove unnecessary code in NotationVisibilityUpdater

Remove unnecessary code in the method
NotationVisibilityUpdater.lookForCorrespondingLabelView(DDiagramElement).

Change-Id: I2288f0007e9b53f30fbe7b08a900ee8bf66e1806
Signed-off-by: Mickael LANOE <mickael.lanoe@obeo.fr>
1 file changed