[btcsuite/btcjson] 586ea1: Use exported field with struct tag in tests.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcjson
  Commit: 586ea151a94707564154a71f24ce260cc2bd7dc8
      
https://github.com/btcsuite/btcjson/commit/586ea151a94707564154a71f24ce260cc2bd7dc8
  Author: Dave Collins <da...@conformal.com>
  Date:   2015-02-19 (Thu, 19 Feb 2015)

  Changed paths:
    M v2/btcjson/help_test.go

  Log Message:
  -----------
  Use exported field with struct tag in tests.

Found by golint.