Updated abstract 'PowerCard' class.

Updated the abstract 'PowerCard' class by setting the 'card' attribute to 'protected' in it.

Projekte/mdga/model/src/main/java/pp/mdga/game/card/PowerCard.java

@@ -16,7 +16,7 @@ public abstract class PowerCard {
      * Create PowerCard attributes.
      */
     private final UUID uuid = UUID.randomUUID();
-    private final BonusCard card;
+    protected BonusCard card;
 
     /**
      * Constructor.
@@ -25,15 +25,6 @@ public PowerCard() {
         this.card = BonusCard.HIDDEN;
     }
 
-    /**
-     * Constructor.
-     *
-     * @param card as the card type of this PowerCard class as BonusCard enumeration.
-     */
-    public PowerCard(BonusCard card) {
-        this.card = card;
-    }
-
     /**
      * This method will be used to call the visit method of the given visitor parameter and pass a PowerCard object.
      *