Fixed bug on mosaic nounce

Author: rg911

src/infrastructure/transaction/SerializeTransactionToJSON.ts

@@ -107,7 +107,7 @@ export const SerializeTransactionToJSON = (transaction: Transaction): any => {
             };
         case TransactionType.MOSAIC_DEFINITION:
             return {
-                nonce: (transaction as MosaicDefinitionTransaction).nonce.toDTO(),
+                nonce: (transaction as MosaicDefinitionTransaction).nonce,
                 mosaicId: (transaction as MosaicDefinitionTransaction).mosaicId.toDTO(),
                 properties: (transaction as MosaicDefinitionTransaction).mosaicProperties.toDTO(),
             };