Fix another error in the notification code
Fix another error in the notification code

In addition to checking whether a recurrent item predates the current
next appointment, we need to check that the actual occurrence of the
item predates the current appointment as well.

Fixes GitHub issue #26.

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

lfos/calcurse,lfos/calcurse,lfos/calcurse