fix: format code for consistency in BusinessCheckingAccount class

Author: ethanhillman

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

@@ -17,7 +17,7 @@ private void validateBusinessOwners() {
         boolean hasBusinessOwner = getOwners().stream()
             .anyMatch(Customer::isBusiness);
 
-        if(!hasBusinessOwner) { 
+        if (!hasBusinessOwner) { 
             throw new IllegalArgumentException("At least one owner must be a business.");
         }
     }