nix: improve elm formating to work for all services
nix: improve elm formating to work for all services

La0/mozilla-relengapi,lundjordan/services,La0/mozilla-relengapi,mozilla-releng/services,andrei987/services,La0/mozilla-relengapi,lundjordan/services,garbas/mozilla-releng-services,garbas/mozilla-releng-services,srfraser/services,lundjordan/services,garbas/mozilla-releng-services,srfraser/services,mozilla-releng/services,La0/mozilla-relengapi,mozilla-releng/services,lundjordan/services,srfraser/services,andrei987/services,srfraser/services,garbas/mozilla-releng-services,andrei987/services,mozilla-releng/services,andrei987/services