Summary:
The original use of noLinks was to provide links to "kfileitem#"
targets, i.e. internal links only reachable when file indexing was
enabled (at Nepomuk times).

originUrls on the other hand are web/ftp server URLs, i.e.
independent from any local indexing.

Test Plan:
  #  Add a originURL to a file:

```
    $> setfattr -n user.xdg.origin.url -v "http://some.domain/"  test.txt

```
  # Make file readonly

With the change, the value label shown for originUrl ("Downloaded
from") stays the same

Reviewers: #baloo, ngraham, astippich

Reviewed By: #baloo, ngraham

Tags: #baloo

Differential Revision: https://phabricator.kde.org/D25238