Missing margin on stroked buttons in card actions

[CharlBest]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Left and right margin should be added to stroked buttons in card actions

What is the current behavior?

No margin is being applied. Only to normal and raised buttons.

What are the steps to reproduce?

https://stackblitz.com/edit/angular-5xgbjx?file=app/button-overview-example.html

What is the use-case or motivation for changing an existing behavior?

Stroke button should have the same behavior as normal and raised buttons in card actions

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

Angular 8
Material 8

Is there anything else we should know?

n/a

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