BZ-1169777 - Source tab inconsistencies - editing allowed

(cherry picked from commit 500df0bdfebebd23000d52d40a424bf3be08e027)

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