fix: withdraw_withNegativeAMount thrownby

removes ';' so the 'withMessage' adds onto the withdraw action

Author: AmiyahJo

lesson_17/bank/bank_app/src/test/java/com/codedifferently/lesson17/bank/SavingsAccountTest.java

@@ -51,7 +51,7 @@ void deposit() {
   @Test
   void deposit_withNegativeAmount() {
     assertThatExceptionOfType(IllegalArgumentException.class)
-        .isThrownBy(() -> classUnderTest.deposit(-50.0));
+        .isThrownBy(() -> classUnderTest.deposit(-50.0))
         .withMessage("Deposit amount must be positive");
   }