Bug 1042508 - Guided Editor - when closing as asset always asks "Are you sure you want to discard unsaved data" even if nothing has been changed

(cherry picked from commit 19de871f180f3393374cab5d9d7c771978b99ef3)

Conflicts:
	kie-wb-common-screens/kie-wb-common-data-modeller/kie-wb-common-data-modeller-client/src/main/java/org/kie/workbench/common/screens/datamodeller/client/DataModelerScreenPresenter.java