Update CredentialsContainer API data for Opera (#7298)
Update CredentialsContainer API data for Opera (#7298)

This commit updates the Opera data for the CredentialsContainer API
based upon results from the mdn-bcd-collector project (Opera 12.16,
15, and 70) with mirroring from Chrome.
mdn/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data