Regression: Change create channel icon

[karlprieb]

@RocketChat/core

[engelgabriel]

@karlprieb you need to fix the test:

1) [Main Elements Render]
       [Side Nav Bar]
         render:
           it should show the new channel button:

      Uncaught AssertionError: expected false to be true
      + expected - actual

      -false
      +true