Restore border-radius to .card (twbs#42449)

* restore border-radius to .card

* bw fix

Author: mdo

.bundlewatch.config.json

@@ -26,7 +26,7 @@
     },
     {
       "path": "./dist/css/bootstrap.css",
-      "maxSize": "48.5 kB"
+      "maxSize": "48.75 kB"
     },
     {
       "path": "./dist/css/bootstrap.min.css",

scss/_card.scss

@@ -47,7 +47,7 @@ $card-tokens: defaults(
     word-wrap: break-word;
     background-color: var(--card-bg);
     // border: var(--card-border-width) solid var(--card-border-color);
-    // @include border-radius(var(--card-border-radius));
+    @include border-radius(var(--card-border-radius));
     @include box-shadow(var(--card-box-shadow));
 
     > hr {