fix:made the isCheckCreationAllowed variable final in Savings Account file

Author: “Tezz03”

lesson_17/bank/bank_app/src/main/java/com/codedifferently/lesson17/bank/SavingsAccount.java

@@ -7,7 +7,7 @@
 /** Represents a saving account. */
 public class SavingsAccount extends BankAccount {
   // private boolean isActive;
-  private boolean isCheckCreationAllowed;
+  private final boolean isCheckCreationAllowed;
   private static final Logger logger = LoggerFactory.getLogger(SavingsAccount.class);
 
   /**