make input underline thick when in error state.

[mmalerba]

also add underline ripple effect from the mocks

demo: https://mmalerba-demo1.firebaseapp.com/input

fixes #3490

[jelbourn]

LGTM

[willshowell]

Shouldn't it also be thicker under hover too?

And maybe it isn't as high of a priority and could be done later, but it looks like switching to error state should also trigger a ripple. Seen here

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