Splash page widget conflicts with selectDocumentOnModuleIntroduction utility

[alexgao1]

A document being selected in a module from the selectDocumentOnModuleIntroduction utility will send a selected event. This will simulate an interaction in the page which will no longer show the widget if it detects that such has occurred.

https://github.com/GCRC/nunaliit/blob/master/nunaliit2-js/src/main/js/nunaliit2/n2.widgetSplash.js#L98