mat-card-(sub)title wrong margin

[saithis]

Bug, feature request, or proposal:

when using mat-card with a mat-card-(sub)title but without a mat-card-avatar, then the title still has a left margin and is not aligned with the content text.

What is the expected behavior?

The title and content text should be aligned like show here https://material.io/components/cards when checking the "Supporting text" box.

What is the current behavior?

The title is not aligned with the content text. (title has a margin left, but content doesn't)

What are the steps to reproduce?

https://stackblitz.com/edit/angular-card-header-bug

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

It looks wrong and doesn't follow the material design guide.

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

I tested it with the following:
angular 9.1
angular material 9.2
Windows 10
Typescript 3.8
Chrome and Firefox

Is there anything else we should know?

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