js-sdk interactive auth now sends email token
We previously sent it in componentWillMount of the email token
auth component which definitely gets us on react's naughtly list.
We now pass the js-sdk a callback it can call at the appropriate
time to send the token (https://github.com/matrix-org/matrix-js-sdk/pull/926).
We should make password reset and adding email addresses work the
same way, but currently they don't even use the interactive-auth
helpers(!) so they're unaffected.
https://github.com/vector-im/riot-web/issues/9586
