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 Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0b8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p28 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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

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