No longer need counterpart
No longer need counterpart

We now use stock counterpart, but indirectly via react-sdk so no
need to depend on it directly.

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