Fixes indentation for css engines when using express to scaffold an application

Generating an express application with `express -c less` generates an app.js file like this

    ...
    app.use(app.router);
      app.use(require('less-middleware')({ src: __dirname + '/public' }));
    app.use(express.static(path.join(__dirname, 'public')));
    ...

After applying this fix the indentation for the css middleware is fixed and the app.js flile will look like this:

    ...
    app.use(app.router);
    app.use(require('less-middleware')({ src: __dirname + '/public' }));
    app.use(express.static(path.join(__dirname, 'public')));
    ...