Fix docker repository name in construct_docker_runner_image_name.sh

## Background:
- construct_docker_runner_image_name.sh generate the tag for docker files
- currently it generates the following exasol/script-languages:container-tool-runner-$VERSION
- however, with this the script push_docker_runner_image.sh fails, because this docker repository doesn't exist
- the correct repository is exasol/script-language-container