compile.sh: Fix bad variable dereference

compile.sh

@@ -68,7 +68,7 @@ function compile() {
 	file="bin/FC_pregmod.html"
 	if [[ -d .git ]]; then
 		COMMIT=$(git rev-parse --short HEAD) # Find and insert current commit
-		printf "App.Version.commitHash = '%s';\n" $(COMMIT) > src/002-config/fc-version.js.commitHash.js
+		printf "App.Version.commitHash = '%s';\n" ${COMMIT} > src/002-config/fc-version.js.commitHash.js
 		if [[ "$usehash" ]]; then
 			file="bin/FC_pregmod_${COMMIT}.html"
 		fi