Corrección valor de constante STATUS_CAPTURED

Se modifica valor de constante STATUS_CAPTURED de 'PARTIALLY_NULLIFIED' a 'CAPTURED', de acuerdo a lo que se especifica en la documentación de Transbank.

src/Utils/TransactionStatusEnum.php

@@ -8,6 +8,6 @@ class TransactionStatusEnum
     const STATUS_NULLIFIED = 'NULLIFIED';
     const STATUS_REVERSED = 'REVERSED';
     const STATUS_PARTIALLY_NULLIFIED = 'PARTIALLY_NULLIFIED';
-    const STATUS_CAPTURED = 'PARTIALLY_NULLIFIED';
+    const STATUS_CAPTURED = 'CAPTURED';
     const STATUS_FAILED = 'FAILED';
 }