Update tests to actuall behavior

[denysdovhan]

Related to: https://github.com/babel/babel-brunch/pull/45#issuecomment-269006540

Fix problem with single-var notation:

Expected:

var a = c.a;
var b = c.b;

But got actual:

"use strict";

var c = {};
var a = c.a,
    b = c.b;