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 da59f96e3ae82ad41141f16f12cbf0784b0befa9)

Conflicts:
	drools-wb-screens/drools-wb-dsl-text-editor/drools-wb-dsl-text-editor-client/src/main/java/org/drools/workbench/screens/dsltext/client/editor/DSLEditorPresenter.java
	drools-wb-screens/drools-wb-enum-editor/drools-wb-enum-editor-client/src/main/java/org/drools/workbench/screens/enums/client/editor/EnumEditorPresenter.java
	drools-wb-screens/drools-wb-globals-editor/drools-wb-globals-editor-client/src/main/java/org/drools/workbench/screens/globals/client/editor/GlobalsEditorPresenter.java
	drools-wb-screens/drools-wb-guided-dtable-editor/drools-wb-guided-dtable-editor-client/src/main/java/org/drools/workbench/screens/guided/dtable/client/editor/GuidedDecisionTableEditorPresenter.java