Decoloring of commentsIcon does not work

[fosterfarrell9]

If you resolve all comments on the /main/comments page by clicking the corresponding button (alternatively, the last remaining comment), the #commentsIcon keeps its yellow color (until the next page load) instead of becoming white again immediately. The reason is that this is handled in app/views/readers/update_all.coffee (resp. app/views/readers/update.coffee) via

$('#commentsIcon').removeClass('text-primary').addClass('text-light')

but the coloring is no longer given by the text-primary class in the new navbar. So, the fix should be pretty easy.