Update lib/generators/rails_template18f/oscal/templates/bin/trestle.tt

"double "quote" all" the things

Co-authored-by: Paul Hirsch <[email protected]>

lib/generators/rails_template18f/oscal/templates/bin/trestle.tt

@@ -5,6 +5,6 @@ if [ "$1" != "" ]; then
     command=$1
 fi
 
-oscal_location="$(dirname $(realpath $0))/../doc/compliance/oscal"
+oscal_location="$(dirname "$(realpath "$0")")/../doc/compliance/oscal"
 
 docker run -it --rm -v $oscal_location:/app/docs:rw ghcr.io/gsa-tts/trestle:<%= docker_trestle_tag %> $command