[Libreoffice] Cherry pick request: Fix always-false condition of FullCommentURL

[Harri Pitkänen]

Release notes for 3.5 mention a new feature for grammar checker
developers, the FullCommentURL property. I tried to use it but could not
get any visible results with 3.5beta2. Then I looked at git history and
noticed that the following fix from László Németh seems to be present only
on master:

  http://cgit.freedesktop.org/libreoffice/core/commit/?id=e2812dd41916cb90c28782b855a100edb4b681b0

I think it would make sense to cherry pick that to libreoffice-3-5.

Harri