Werk #6969: Fixed recurring flexible downtimes.

Previously, the combination of "recurring" and "flexible" was broken for downtimes. The effect was that such downtimes remained hot even outside their intended time window, so that the next occurring problem just triggered the start of such a downtime and no problem was notified.

An example for such a scenario: A flexible host downtime was configured to happen every day between 02:00 and 03:00 for 2 hours. Everything was OK between 02:00 and 03:00, but at 08:15 the host went DOWN. This started the downtime, lasting until 10:15, which is of course totally unintended: The problem did not happen between 02:00-03:00, so the downtime should not start and normal problem processing should be done, including notifications etc.

This has been fixed, so the recurring flexible downtimes are working as intended now. If you update your installation, there is nothing more you have to do, all downtimes automatically work correctly after that. If you do not want to update yet, you should delete your recurring flexible downtimes for now and add new recurring fixed downtimes instead as a workaround until you update.

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