fixed searching across portals
fixed searching across portals

Now only pass the token when searching the same portal the user authenticated in.
This fixes a problem for users signing into a portal and then trying to search ArcGIS Online. Their portal's token was causing the search request to fail.

nheminger/ago-assistant,dmartine/ago-assistant,Esri/ago-assistant,nheminger/ago-assistant,Esri/ago-assistant,ecaldwell/ago-assistant,dmartine/ago-assistant,ecaldwell/ago-assistant