fix(docker): remove accidental command substitutions when building FE in dev mode (#37670)

Author: hainenber

docker/docker-frontend.sh

@@ -28,11 +28,11 @@ if [ "$BUILD_SUPERSET_FRONTEND_IN_DOCKER" = "true" ]; then
     cd /app/superset-frontend
 
     if [ "$NPM_RUN_PRUNE" = "true" ]; then
-        echo "Running `npm run prune`"
+        echo "Running \"npm run prune\""
         npm run prune
     fi
 
-    echo "Running `npm install`"
+    echo "Running \"npm install\""
     npm install
 
     echo "Start webpack dev server"