[FIX] Transaction Summary doesn't show Destination Tag (RT-1462)

@annatonger

#/tx?id=A240D5C8F90C04071CB5C3A648E07FEF65B79D820C953C2D8C74879E0B5F6FEB
![image](https://cloud.githubusercontent.com/assets/158528/3893092/eec66398-2237-11e4-97e1-35831d045a39.png)

#/tx?id=C5A65016F56A772868168C2AD846004F318F97C3EE47676ED9B384671F7FC174
![image](https://cloud.githubusercontent.com/assets/158528/3893087/e84a0b46-2237-11e4-910f-fce836fefe41.png)

[RT-1462](https://ripplelabs.atlassian.net/browse/RT-1462) [BS](https://www.bountysource.com/issues/2842633-ripple-trade-transaction-summary-doesn-t-show-destination-tag)