calcurse-caldav: Use right diffs when synchronizing
calcurse-caldav: Use right diffs when synchronizing

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 <2450ec3ccdf9492f0296810ab160876644aa9cff@lauresfamily.fr>
Signed-off-by: Lukas Fleischer <c9ca73f8336dcfb037ec2c2abf52d80a6847a5cd@calcurse.org>

lfos/calcurse,lfos/calcurse,lfos/calcurse