tdf#118425 xmlsecurity UI: fix OOXML signing

Regression from 13596e704e4b48e8b0892867b3f3fc351a2729f9 (Don't pass ODF
version, just retrieve it directly, 2018-05-17), just checking the file
format explicitly like the PDF signing does fixes the problem.

Change-Id: I1ba7cf9096e01c6c5a2d3875b08fa3a66acae829
Reviewed-on: https://gerrit.libreoffice.org/56635
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
(cherry picked from commit 02119ce226ef7c1fcf419aa0933aa95381ee309b)
Reviewed-on: https://gerrit.libreoffice.org/56663
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>

0 files changed, 0 insertions, 0 deletions