Fix card-sorting;

js/CardDeck.js

@@ -60,12 +60,7 @@ class CardDeck {
         let cardCount = this.cards.length, t, i;
 
         for (let run = 0; run === runs; run++) {
-            while (cardCount) {
-                i = Math.floor(Math.random() * cardCount--);
-                t = this.cards[cardCount];
-                this.cards[cardCount] = this.cards[i];
-                this.cards[i] = t;
-            }
+            this.cards.sort( () => Math.random() - 0.5);
         }
     }