[FIX] Transaction details displaying wrong value sent (RT-2646)

As a result, this pull request also fixed a similar bug in the history tab. For example(Transaction #E79AC11430A02DCB3383C8B36BF0481E52212737C511DCD17FCE44BC65700B8D):
![ripple-history-bug](https://cloud.githubusercontent.com/assets/1846668/5151887/cb7ea8c2-721f-11e4-879c-b25aceb2f9eb.png)

It is easy to guess why the bug exists from the bug in the history tab.