sysutils/zeitgeist: update to 1.0.4 - prepare for lang/vala update

Overall:
 - Fix compile error with new vala
 - Move systemd services to session slice
 - Add PartOf=graphical-session.target to all systemd units

Libzeitgeist:
 - Ensure releated data is removed when deleting events
 - Fix search_with_relevancies to call proxy with correct arguments

PR:		249940