Fix grep command on LGTM_INDEX_FILTERS

Author: lcartey

extractors/cds/tools/index-files.sh

@@ -81,7 +81,7 @@ else
     # If it is set, we will try to honour the paths-ignore filter
     # Split by \n and find all the entries that start with exclude, excluding "exclude:**/*" and "exclude:**/*.*"
     # and then join them back together with \n
-    exclude_filters="\n$(grep '^exclude' "$LGTM_INDEX_FILTERS" | grep -v 'exclude:**/\*\|exclude:**/\*\.\*')"
+    exclude_filters="\n$(echo "$LGTM_INDEX_FILTERS" | grep '^exclude' | grep -v 'exclude:**/\*\|exclude:**/\*\.\*')"
 fi
 
 # Enable extraction of the cds.json files only