Fixed scrollto for search results

Now passing the "scrollto" URL argument to the file list class which
will also automatically scroll and highlight the matching element.

This code is triggered by the search box when in a different folder and
also by the activity app.
Scroll to new file/folder after adding

When creating a new file from the menu, the list now scrolls to that
file.
add / to url to match route
Merge pull request #10860 from owncloud/scrolltofix

Scroll to file on search or add