scripts: Fix quoting to prevent unintended word splitting

scripts/firesim-setup.sh

@@ -8,11 +8,11 @@ set -o pipefail
 RDIR=$(pwd)
 scripts_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 
-cd $scripts_dir/..
+cd "${scripts_dir}/.."
 
 # Reenable the FireSim submodule
 git config --unset submodule.sims/firesim.update || true
 git submodule update --init sims/firesim
 cd sims/firesim
-./build-setup.sh $@ --library
-cd $RDIR
+./build-setup.sh "$@" --library
+cd "$RDIR"