Update ebay (allows only a single passkey)

[arxo]

Site name

eBay

Site URL

https://ebay.com

Update reason

Other (please describe below).

Additional information

As noted in Security Now episode 978 eBay is among those sites that do not allow registering more than one passkey. This should be noted.

Issue Eligibility

• The issue I'm creating is not a duplicate of an existing issue.
• The issue I'm creating is not a duplicate of an existing pull request