agpl-3.0_326.RULE should be agpl 3.0 or later

[armijnhemel]

Description

related to #5001 : this rule is clearly agpl-3.0-plus:

This program is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public Licence as published by
the Free Software Foundation, either version 3 of the Licence, or (at
your option) any later version.

but the license_expression is agpl-3.0:

license_expression: agpl-3.0