Fix explicit decryption code in tour (#1047)

JAVA-4809

Author: jyemin

driver-reactive-streams/src/examples/reactivestreams/tour/ClientSideEncryptionExplicitEncryptionAndDecryptionTour.java

@@ -122,7 +122,9 @@ public static void main(final String[] args) {
         System.out.println(doc.toJson());
 
         // Explicitly decrypt the field
-        System.out.println(clientEncryption.decrypt(new BsonBinary(doc.get("encryptedField", Binary.class).getData())));
+        Binary encryptedField = doc.get("encryptedField", Binary.class);
+        BsonString decryptedField = clientEncryption.decrypt(new BsonBinary(encryptedField.getType(), encryptedField.getData())).asString();
+        System.out.println(decryptedField.getValue());
 
         // release resources
         clientEncryption.close();

driver-sync/src/examples/tour/ClientSideEncryptionExplicitEncryptionAndDecryptionTour.java

@@ -102,7 +102,9 @@ public static void main(final String[] args) {
         System.out.println(doc.toJson());
 
         // Explicitly decrypt the field
-        System.out.println(clientEncryption.decrypt(new BsonBinary(doc.get("encryptedField", Binary.class).getData())));
+        Binary encryptedField = doc.get("encryptedField", Binary.class);
+        BsonString decryptedField = clientEncryption.decrypt(new BsonBinary(encryptedField.getType(), encryptedField.getData())).asString();
+        System.out.println(decryptedField.getValue());
 
         // release resources
         clientEncryption.close();