collab: Don't try to transfer usage when a Zed Pro trial is canceled (#29843)

This PR fixes an issue where we would erroneously try to transfer
existing subscription usage when a Zed Pro trial was canceled.

Release Notes:

- N/A

crates/collab/src/api/billing.rs

@@ -1040,6 +1040,7 @@ async fn handle_customer_subscription_event(
                 billing_customer.user_id,
                 &existing_subscription,
                 subscription_kind,
+                subscription.status.into(),
                 new_period_start_at,
                 new_period_end_at,
             )