Do not send file list for select all on Download/delete

- When all files are selected, do not send the whole file list
- Download will trigger download for the parent folder, also works
  with root
- Delete will send "allfiles" to the server that will find the file
  list or the passed directory by itself
Trashbin select all now doesn't send file list

- Fixed "delete" and "restore" actions to not send the file list when
  all files are selected
- When some files are selected, sends the current dir
- Removed "dirListing" attribute as the backend is able to compute the
  value based on the current dir
Merge pull request #7195 from owncloud/files-selectall

Do not send file list for select all on Download/delete