calcurse-caldav: Use -G and %(hash) to list hashes
calcurse-caldav: Use -G and %(hash) to list hashes

Instead of reimplementing the code to generate object hashes in the
synchronization script, use format strings to print the hashes in grep
mode.

Signed-off-by: Lukas Fleischer <c9ca73f8336dcfb037ec2c2abf52d80a6847a5cd@calcurse.org>

lfos/calcurse,lfos/calcurse,lfos/calcurse