Fix: Change parent of BridgeRoom to AbstractBridgeObject

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/BridgeRoom.java

@@ -11,10 +11,10 @@ public class BridgeRoom extends AbstractRoom {
     @Serial
     private static final long serialVersionUID = -276088332165299253L;
 
-    private BridgeObject parent;
+    private AbstractBridgeObject parent;
     private final List<BridgeRoomFurniture> furnitureList =  new ArrayList<>();
 
-    public void setParent(BridgeObject parent) {
+    public void setParent(AbstractBridgeObject parent) {
         this.parent = parent;
     }
 
@@ -24,6 +24,7 @@ public class BridgeRoom extends AbstractRoom {
 
     public void addFurniture(BridgeRoomFurniture furniture) {
         furnitureList.add(furniture);
+        furniture.setParent(this);
     }
 
     @Override
@@ -31,7 +32,7 @@ public class BridgeRoom extends AbstractRoom {
         return furnitureList;
     }
 
-    public BridgeObject getParent() {
+    public AbstractBridgeObject getParent() {
         return parent;
     }