[FIX] Navbar dropdown showing all balances (RT-1575)

[Jira RT-1575](https://ripplelabs.atlassian.net/browse/RT-1575)
[Bountysource](https://www.bountysource.com/issues/2842592-ripple-trade-click-on-xrp-amount-in-top-right-dropdown-showing-all-balances)