nixosTests.snipe-it: fix test

    with subtest("Circumvent the pre-flight setup by just writing some settings into the database ourself"):

        snipeit.succeed(

            """

            mysql -D ${nodes.snipeit.services.snipe-it.database.name} -e "INSERT INTO settings (id, user_id, site_name) VALUES ('1', '1', '${siteName}');"

            mysql -D ${nodes.snipeit.services.snipe-it.database.name} -e "

            INSERT INTO settings (id, site_name, login_remote_user_custom_logout_url, login_remote_user_header_name)

            VALUES ('1', '${siteName}', 'https://whatever.invalid', 'whatever');"

            """

        )