[FIX] Trust: Remove duplicate reserve warning (RT-2767)

When trying to connect a gateway while there are insufficient reserve
funds, the yellow warning bar appeared twice: Once above the content,
once on the right of the currencies menu.
Merge pull request #1862 from jublonet/issue/2767-trust-duplicate-insuf-reserve-warning

[FIX] Trust: Remove duplicate reserve warning (RT-2767)