No need to pass file URL explicitly - it's available as GetURLObject().
commit 607b80ca follow-up.

Change-Id: I6a2ceb6d3ae78c277f40215082af22112f9e2d27
Reviewed-on: https://gerrit.libreoffice.org/65300
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>