Dialog: mat-stroked-button doesn't have margin in mat-dialog-actions

[Wykks]

What is the expected behavior?

A margin-left: 8px; in actions buttons (except the first one).

What is the current behavior?

When using stroked buttons, the margin is missing

What are the steps to reproduce?

https://stackblitz.com/edit/angular-r6u5wc

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

@angular/material & cdk 7.3.5

[crisbeto]

Will be fixed by #11961.

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