LPS-43263 - Clicking Content, Applications, or Page in the Add menu will fire two javascript requests instead of one

Hey @natecavanaugh,

Attached is an update for http://issues.liferay.com/browse/LPS-43263.

NOTE:
"The code I removed from both of these files were duplicated in the other, total copies.

I left onPortletClose() in dockbar_add_application.js because that file handles the adding and removal of portlets from the applications tab, and because it wasn't even working in the other file. I left onShowTab() in dockbar_add_content.js because we are storing many other session_clicks in that file, so it fits." - @Robert-Frampton 

Please let me know if you have any questions.  Thanks!