Werk #16495: check_mailboxes: fix check of multiple mailboxes

Component	Checks & agents
Title	check_mailboxes: fix check of multiple mailboxes
Date	Mar 4, 2024
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.4.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p26 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

When selecting to check multiple mailboxes, the software always checked only the last specified mailbox. This werk fixes this behaviour.

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