MDC Select's scaleX logic is currently unused/overridden

[kfranqueiro]

MDC Select contains code to set transform-origin for the purposes of applying a scaleX transform to the bottom-line element, but it is currently overridden by the scaleY transform in the focused and open states anyway. This means that the JS logic to determine the transform-origin is just wasting resources at the moment.

We should either figure out a way for these transforms to coexist, or remove the excess JS logic that ultimately isn't doing anything.

[lynnmercier]

See #1981 for how we plan on adding the bottom line to MDCSelect...now that we've removed the scaleX logic