calcurse-caldav: Fix appointment imports
calcurse-caldav: Fix appointment imports

When importing an appointment from the server, make sure we store a hash
of the item in the sync DB, and not the serialized item itself.

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

lfos/calcurse,lfos/calcurse,lfos/calcurse