chore: fix bash

script/make_utils/run_use_case_examples.sh

@@ -12,7 +12,7 @@ fi
 
 echo "Running notebooks with PIP installed Concrete ML"
 
-if [[ $(git ls-files --others --exclude-standard | grep ${USE_CASE_REL_DIR}) ]]; then
+if git ls-files --others --exclude-standard | grep -q "${USE_CASE_REL_DIR}"; then
     echo "This script must be run in a clean clone of the Concrete ML repo"
     echo "This directory has untracked files in ${USE_CASE_REL_DIR}"
     echo "You can LIST all untracked files using: "