Fix CSS font-face minification (#8106)

Author: sidonaldson

packages/react-scripts/config/webpack.config.js

@@ -269,6 +269,9 @@ module.exports = function(webpackEnv) {
                 }
               : false,
           },
+          cssProcessorPluginOptions: {
+              preset: ['default', { minifyFontValues: { removeQuotes: false } }]
+          }
         }),
       ],
       // Automatically split vendor and commons