Fix border if only one card

Created by: MartijnCuppens

Closes #28060.

I'm going to do some checks if Netlify has finished, so currently in draft

scss/_card.scss

@@ -273,7 +273,7 @@
       }
     }
 
-    &:first-of-type {
+    &:first-of-type:not(:last-of-type) {
       border-bottom: 0;
       @include border-bottom-radius(0);
     }