HT-368: Prevent display of ScriptTextHasChangedControl when displaying end of chapter. This also prevents re-entrancy in UpdateDisplay and prevents crash
HT-368: Prevent display of ScriptTextHasChangedControl when displaying end of chapter. This also prevents re-entrancy in UpdateDisplay and prevents crash

sillsdev/hearthis,sillsdev/hearthis,sillsdev/hearthis