fix (mat-select): do not allow ctrl + arrowUp/arrowDown when mat-select closed and focused

[d8dev]

Bug, feature request, or proposal:
Bug.

What is the expected behavior?
When mat-select closed and focused, switching should not work with ctrl + ArrowUp / ctrl + ArrowDown ,like in classic html select.

What is the current behavior?
When mat-select closed and focused I can switch option with ctrl + ArrowUp / ctrl + ArrowDown hotkeys.

What are the steps to reproduce?
Demo Stackblitz

Which versions of Angular, Material, OS, TypeScript, browsers are affected?
Windows 10 Pro 64bit, Google Chrome Version 70.0, Mozilla Firefox 63.0.1, Angular 6 / 7, Angular Material 6 / 7, TypeScript 3.1.

[crisbeto]

Should be resolved by #13503.

[d8dev]

Great, thx!

[crisbeto]

Closing since #13503 got in a while ago.

[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.}