[CSS-Typed OM] CSSScaleValue should accept one argument

[Rumyra]

In CSS you can use one value inside of a scale function and it will apply to both x and y axis.

This is not the case for the CSSScaleValue - which doesn't have a one argument constructor version. At the moment we do this:

new CSSScale(CSS.number(2), CSS.number(2))

Would make sense to do new CSSScale(CSS.number(2))