cleanup: replace oneWay with toView

[jdanyow]

We should standardize the internals on toView now that it has landed. Here's one instance, probably others...

templating-binding/src/binding-language.js

Line 57 in ebd3dc2

bindingMode.oneWay,

We still need to support oneWay but the internals should use toView where possible.

related to aurelia/binding#629

[veikkoeeva]

Is this and the linked ones low-risk changes? :)

[bigopon]

Zero risk i would say 👍

[veikkoeeva]

Should someone reel this wandering fix in? One place at a time is good enough for making progress. :)

[bigopon]

@veikkoeeva that'd be awesome 😄