Bugfix: Remove deleted files from search result

Deleted file has been removed from filesSearched state by adding a new mutation.
Also, filter condition in remove file mutations has been changed from object reference to unique file id.

https://github.com/owncloud/web/pull/3266
https://github.com/owncloud/web/issues/3043
https://github.com/owncloud/web/issues/3044
