$.observable.un with handlers hash and ctx not working

[andre487]

When we call un like this:

obs.un({
    event1: handler1,
    event2: handler2
}, ctx);

it does not works because the code does not make corrections in hash branch:

            } else {
                var _this = this;
                $.each(e, function(e, fn) {
                    _this.un(e, fn, ctx);
                });
            }

In this place the ctx var is always undefined because the right ctx is assigned to function's param fn.

[Yeti-or]

BEM-2250