multimedia/totem: drop unused Meson options after 38ae40f5daf7

meson.build:1:0: ERROR: Unknown options: "enable-vala"

https://gitlab.gnome.org/GNOME/totem/-/commit/627c1ee182ea

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