fix(material/list): not working correctly when list item is used as a button (#13617)
fix(material/list): not working correctly when list item is used as a button (#13617)

Based on our selector for `mat-list-item`, we allow it to be a `button`, however we don't do the necessary resets for it to be usable.
crisbeto/material2,angular/components,crisbeto/material2,crisbeto/material2,angular/components,angular/components,angular/components,crisbeto/material2