Simplify license check: don't specify the entry point

Author: dneto0

kokoro/license-check/presubmit.sh

@@ -22,5 +22,4 @@ ROOT_DIR="$( cd "${SCRIPT_DIR}/../.." >/dev/null 2>&1 && pwd )"
 docker run --rm -i \
   --volume "${ROOT_DIR}:${ROOT_DIR}" \
   --workdir "${ROOT_DIR}" \
-  --entrypoint /bin/license-checker \
   us-east4-docker.pkg.dev/shaderc-build/radial-docker/ubuntu-24.04-amd64/license-checker