Fix the implementation of killNote(), it did nothing when force == true.
Thanks for the report!
BUG:127063

This also fixes the embarrasingly wrong implementation of KNotesPart::notes(),
it returned the body of the notes, not the title. This is a behavior change
for the DCOP interface but the previous implementation was just plain wrong
and contradictory to the documentation and to the implementation of the
KNotes app itself.