sysutils/tracker: drop unused Meson options after 2c352e0f7328

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

https://gitlab.gnome.org/GNOME/tracker/-/commit/d318ebeb5d4f
is missing in 2.3.4 unlike 3.1.2 used by sysutils/tracker3.

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