Using just routerLinkActive doesn't work on first load, the query
parameter might not be defined. Adding 'active' to the class attribute
doesn't work either, it doesn't get removed after switching to the other
view.

For now it allows to switch between list and grid views.

Fixes https://github.com/DSpace/dspace-angular/issues/171

fixed an issue where the remote data state observable would only fire for the first time after the response had already returned