Tell server we can handle refresh tokens

It's actually set by the SDK internally as well, but set it explicitly here to be clear.

src/services/matrix.service.js

@@ -172,6 +172,7 @@ export default {
                         .register(userId, pass, user.registration_session || null, {
                             type: "m.login.dummy",
                             initial_device_display_name: this.$config.appName,
+                            refresh_token: true
                         })
                         .then((response) => {
                             return extractAndSaveUser(response);