Fix parameter order in CSSStyleDeclaration

[theqp]

This is a breaking change.

---

Checklist:

• Added the change to the changelog's "Unreleased" section with a reference to this PR (e.g. "- Made a change (#0000)")
• Linked any existing issues or proposals that this pull request should close
• Updated or added relevant documentation
• Added a test for the contribution (if applicable)

[thomashoneyman]

@garyb I see the 👍 -- is this something we want to standardize on? The foreign-import object going last?

[garyb]

Not so much the foreign-import object going last as "the thing being operated on", as that's the convention generally everywhere - collections, refs, is (should) be the case with the other web libraries, etc. 🙂

[JordanMartinez]

Is this another breaking change to make in v0.15.0?

[thomashoneyman]

Let's do it!