Use spacing vars in facet line styling

Author: spaceo

src/stories/Library/search-result-page/facet-line.scss

@@ -7,7 +7,7 @@
     .dropdown__select {
       @extend %text-tags;
       height: 100%;
-      padding: 8px 16px;
+      padding: $s-sm $s-md;
       min-width: 200px;
     }
     .dropdown__arrows {
@@ -27,7 +27,7 @@
     .dropdown__select {
       @extend %text-tags;
       height: 100%;
-      padding: 8px 16px;
+      padding: $s-sm $s-md;
       min-width: 100px;
     }
     .dropdown__arrows {