Some parameters where swapped accidentally when reworking the diff computation in c8d3d87 (calcurse-caldav: Compute diffs before synchronizing, 2016-12-13) such that the synchronization functions were working with incorrect diffs since that commit. Exchange the parameters again to fix this. Reported-by: Guillaume Laurès <guillaume@lauresfamily.fr> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>