BUG: avoid duplicated saveState when using applyScopedLabel in editor

Since the Chagne and Save island effects use the superclass's
applyScopedLabel method they don't need to explicitly save state
(it is done automatically).

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22245 3bd1e089-480b-0410-8dfb-8563597acbee