fix(input): match up all label transitions

[tjlav5]

Change all label transitions to be 0.25s long, as the default is.

Fixes#6328

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[tjlav5]

I signed it!

[googlebot]

CLAs look good, thanks!

[ThomasBurleson]

@topherfangio - needs review and validation with Spec.

[topherfangio]

Spec-wise, I think this is compliant (I can't find anything that specifies exactly what it should be).

However, since we're using a special timing, I'd like to see it as a variable (perhaps $md-float-animation-duration or similar) so that we know that it is custom and we can easily change it in one place.

[tjlav5]

@topherfangio good point. I'll consolidate under a variable tonight. Cheers

[tjlav5]

@topherfangio considering that the transitions all use the $swift-ease-out-timing-function, should the timing duration ALSO be using $swift-ease-out-duration?

[topherfangio]

@tjlav5 Yes, it should use the ease-out duration. Thanks for updating!

I am restarting the Travis build to ensure all the tests pass (there was an unrelated build issue which was causing the failure).

[EladBezalel]

Bumped to Topher as it seems that he's in charge here 😄

[ThomasBurleson]

@tjlav5 - please Rebase with latest from master

[tjlav5]

@ThomasBurleson sorry missed the rebase request. But it looks like you handled it.
Cheers