Re-enable upgrade registration.
Re-enable upgrade registration.

Revert https://github.com/vector-im/vector-web/issues/818 now that https://github.com/vector-im/vector-web/issues/759 is fixed.

KentShikama/vector-web,vector-im/vector-web,vector-im/riot-web,vector-im/riot-web,KentShikama/vector-web,vector-im/riot-web,KentShikama/vector-web,martindale/vector,vector-im/riot-web,vector-im/riot-web,vector-im/vector-web,KentShikama/vector-web,vector-im/riot-web,vector-im/vector-web,martindale/vector,vector-im/vector-web,KentShikama/vector-web,vector-im/vector-web,KentShikama/vector-web