deskutils/bijiben: drop unused Meson options after 081c758935b7

meson.build:1:0: ERROR: Unknown options: "zeitgeist"

https://gitlab.gnome.org/GNOME/bijiben/-/commit/bcfbd9a4113b

PR: 259080
Reported by: antoine (via exp-run)
Regressed by: https://github.com/mesonbuild/meson/commit/dbf2ace6ca1c