[btcsuite/btcd] 51fca6: wire: Remove duplicate tx error path tests.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: 51fca61707a0cfc4c935936aa5df02a6a56d95d5
      
https://github.com/btcsuite/btcd/commit/51fca61707a0cfc4c935936aa5df02a6a56d95d5
  Author: Dave Collins <da...@conformal.com>
  Date:   2015-07-26 (Sun, 26 Jul 2015)

  Changed paths:
    M wire/msgtx_test.go

  Log Message:
  -----------
  wire: Remove duplicate tx error path tests.