[weblate] Fix gitlab remote URL (#74)

See: https://salsa.debian.org/tails-team/gitlab-migration/-/issues/74

I'll modify manually in the server.

files/gitolite/install_remotes.sh

@@ -45,7 +45,7 @@ repository_root="${gitolite_root}/repositories"
 	weblate-gatekeeper.git)
             cd "$repository_dir"
             git remote | grep -qs -x gitlab || \
-                git remote add gitlab "git@gitlab.tails.boum.org/tails/tails.git"
+                git remote add gitlab "git@gitlab.tails.boum.org:tails/tails.git"
             ;;
         *)
             ;;