ci: Remove unused TEST_RUNNER_ENV="LC_ALL=C" from s390x task

Author: MarcoFalke

ci/test/00_setup_env_s390x.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019-2022 The Bitcoin Core developers
+# Copyright (c) 2019-present The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -10,7 +10,6 @@ export HOST=s390x-linux-gnu
 export PACKAGES="python3-zmq"
 export CONTAINER_NAME=ci_s390x
 export CI_IMAGE_NAME_TAG="docker.io/s390x/debian:bookworm"
-export TEST_RUNNER_ENV="LC_ALL=C"
 export TEST_RUNNER_EXTRA="--exclude feature_init,rpc_bind,feature_bind_extra"  # Excluded for now, see https://github.com/bitcoin/bitcoin/issues/17765#issuecomment-602068547
 export RUN_FUNCTIONAL_TESTS=true
 export GOAL="install"