pretty-format the benchmarker script which got mangled from editing on vampir

benchmarks/benchmarker.sh

@@ -16,8 +16,8 @@ for json_file in "$json_directory"/*.json; do
     # Check if there are matching files
     if [ -e "$json_file" ]; then
         # Execute the program with the JSON file as parameters
-	bn=$(basename $json_file)
-	name="${bn%.*}"
+        bn=$(basename $json_file)
+        name="${bn%.*}"
         echo "running test ${name} ..."
         "$program_location" "$json_file" "${output_dir}/${name}.json"
     fi