www/epiphany: drop unused Meson options after 6106add6

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

https://gitlab.gnome.org/GNOME/epiphany/-/commit/554a375e8a90

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