refactor(card): remove duplicate style declaration (#13358)
refactor(card): remove duplicate style declaration (#13358)

Removes a duplicate declaration for the `.mat-card-title` margin.

Fixes #13353.
josephperrott/material2,Jefiozie/material2,jelbourn/material2,mmalerba/material2,angular/components,crisbeto/material2,jelbourn/material2,Jefiozie/material2,andrewseguin/material2,andrewseguin/material2,andrewseguin/material2,crisbeto/material2,DevVersion/material2,mmalerba/material2,DevVersion/material2,Jefiozie/material2,jelbourn/material2,mmalerba/material2,crisbeto/material2,josephperrott/material2,andrewseguin/material2,jelbourn/material2,mmalerba/material2,Jefiozie/material2,josephperrott/material2,josephperrott/material2,jelbourn/material2,crisbeto/material2,angular/components,mmalerba/material2,angular/components,angular/components,DevVersion/material2,Jefiozie/material2,josephperrott/material2,andrewseguin/material2,DevVersion/material2,DevVersion/material2