Werk #15472: check_mail_loop, check_mail: Fix argument parsing

Component	Checks & agents
Title	check_mail_loop, check_mail: Fix argument parsing
Date	May 5, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0b8 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p28 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

check_mail_loop and check_mail active checks didn't accept "POP3" as a fetch protocol argument.

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