update license

Co-authored-by: Quentin Gliech <[email protected]>

Author: odelcroi

templates/pages/upstream_oauth2/login_link.html

@@ -1,7 +1,7 @@
 {#
 Copyright 2025 New Vector Ltd.
 
-SPDX-License-Identifier: AGPL-3.0-only
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
 Please see LICENSE in the repository root for full details.
 -#}