5387: remove nested scss

Author: Sine Jespersen

src/stories/Library/list-buttons/list-buttons.scss

@@ -27,14 +27,6 @@
     &__button {
       @extend %ml-32;
       display: flex;
-
-      &--hide-on-mobile {
-        display: none;
-
-        @include breakpoint-s {
-          display: flex;
-        }
-      }
     }
   }
 }