fix(form-field): Make labels show while printing

[ghost]

@mmalerba Look at this please

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed (or fixed any issues), please reply here (e.g. I signed it!) and we'll verify it.

---

What to do if you already signed the CLA

Individual signers

• It's possible we don't have your GitHub username or you're using a different email address on your commit. Check your existing CLA data and verify that your email is set on your git commits.

Corporate signers

• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
• The email used to register you as an authorized contributor must be the email used for the Git commit. Check your existing CLA data and verify that your email is set on your git commits.
• The email used to register you as an authorized contributor must also be attached to your GitHub account.

[ghost]

I signed it

[googlebot]

CLAs look good, thanks!

[mmalerba]

If you remove the perspective(100px) from this rule, I think we can get rid of the whole -ms-transform rule below. You'll probably need to move the + $mat-form-field-legacy-dedupe into the translateY though.

[mmalerba]

It looks like there's a lint error because this line is too long, can you put the scale($font-scale) part on the next line?

[mmalerba]

fixes #12861

[Polyterative]

Is there any way to port this to 6.x? I can't upgrade my major because upgrading flex breaks everything

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}