Fix incorrect path (and just simplify the whole thing)

package.json

···
     "dev": "yarn run development",
     "development": "cross-env NODE_ENV=development webpack",
     "lint": "eslint --cache 'resources/js/**/*.{js,ts,tsx}' 'tests/karma/**/*.{ts,tsx}' '*.js'",
-    "pretty": "prettier --check resources/css/**/*.less",
+    "pretty": "prettier --check .",
     "prod": "yarn run production",
     "production": "cross-env NODE_ENV=production webpack",
     "watch": "yarn run development --watch",

resources/css/utilities.less

···
   display: none !important;
 }
 
-.u-hidden-desktop  {
+.u-hidden-desktop {
   @media @desktop {
     display: none !important;
   }