Grant games events.subscription.manage on openvibe.events: Games subscribes to network.user.token_valid_after so a sign-out everywhere closes game sessions

ddiff --git a/server/identity/principals.js b/server/identity/principals.js
iindex ff662d89..0ea47f03 100644
---- a/server/identity/principals.js
++++ b/server/identity/principals.js
@@@ -40,6 +40,8 @@ const DEFAULT_GRANTS = [
      ['tools', 'media.object.read', 'openvibe.media', ['tools']],
      ['games', 'media.object.upload', 'openvibe.media', ['games']],
      ['games', 'identity.subject.resolve', SELF_AUDIENCE, []],
++    // Games subscribes to network.user.token_valid_after (sign-out everywhere closes game sessions).
++    ['games', 'events.subscription.manage', 'openvibe.events', []],
      // Wave 9: Tips starts purchases and transfers in Billing, follows settlement through Events, and
      // announces delivered tips in the creator's Live chat.
      ['tips', 'billing.intent.create', 'openvibe.billing', []],