This patch fixes an error introduced in c75af857,
with OUString::startsWith() introduced by Lubos Lunak in 095ffaf5
Thanks to Lubos and Kendy.

Change-Id: Idcfb9ef59cfdf4c7b08193f5c137b985fa8b9965
Reviewed-on: https://gerrit.libreoffice.org/573Reviewed-by: Jan Holesovsky <kendy@suse.cz>
Tested-by: Jan Holesovsky <kendy@suse.cz>