Another very small improvement for top borders in lists.

src/Squidex/app/theme/_lists.scss

@@ -94,6 +94,7 @@
             padding: 1rem 1.25rem;
             background: $color-table;
             border: 1px solid $color-border;
+            border-top: 0;
             border-bottom-width: 2px;
             margin-bottom: .25rem;
         }