x11-toolkits/girara: chase Meson option name after 7ab84affb07f

meson.build:1:0: ERROR: Unknown options: "enable-json, enable-notify"

https://git.pwmt.org/pwmt/girara/-/commit/281011a18772

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