Fix CppunitTest_xmlsecurity_signing with system-xmlsec 1.2.26

Swap the order of the default and custom callback registration, since
the order of lookup is now reversed since
<https://github.com/lsh123/xmlsec/commit/968646fb9b8428174a112fce2f08b1ec89d0ed97>.

Thanks Tomas Chvatal for reporting this.

Change-Id: I60a347454701a679db4ccd8924a723a236d5edff
Reviewed-on: https://gerrit.libreoffice.org/55404
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Tomáš Chvátal <tchvatal@suse.cz>

0 files changed, 0 insertions, 0 deletions