style(kff.Collection, kff.BindingView.test): remove legacy commented code
refactor(kff.evalObjectPath): remove closure around function
refactor(kff.BindingView): collection.onEach is only needed when a filter is active.

If there is no filter active on collection binding, it is unnecessary to watch every collection item change, it just slows down rendering.
fixed(binding): make :fill mode work inside collection binding

When :fill was used inside colelction binding, it wouldn't work because cloned input didn't have the original value anymore. To make it work, I get the input value in constructor and save it for later use in fill method (only when options.fill is set).