GET /teams from RTS instead of config.json

Now that the RTS contains config for teams, use GET /teams to get that information so that users will see be able to register as a team (but not yet auto-join rooms, be sent to welcome page or be tracked as a referral).

src/components/structures/MatrixChat.js

@@ -1060,7 +1060,7 @@ module.exports = React.createClass({
                     defaultHsUrl={this.getDefaultHsUrl()}
                     defaultIsUrl={this.getDefaultIsUrl()}
                     brand={this.props.config.brand}
-                    teamsConfig={this.props.config.teamsConfig}
+                    teamServerConfig={this.props.config.teamServerConfig}
                     customHsUrl={this.getCurrentHsUrl()}
                     customIsUrl={this.getCurrentIsUrl()}
                     registrationUrl={this.props.registrationUrl}