Dismissible Dialogs have incorrectly positioned close button on Large scale

[lazd]

Steps to reproduce

1. Go to http://opensource.adobe.com/spectrum-css/2.13.0/docs/?color=light&scale=large&method=standalone#dialog-dialog-dismissible
2. Select Large scale in the dropdown at the top
3. Observe

Spectrum-CSS version

2.13.0

Screenshots (if applicable)

[adobe-bot]

JIRA issue created: https://jira.corp.adobe.com/browse/SDS-1907