Werk #11751: Fix editing site specific global settings

Component	User interface
Title	Fix editing site specific global settings
Date	Dec 7, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0b2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

When trying to edit site specific global settings, an error "The parmeter 'site' is missing" appeared in previous 2.0.0 releases.

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