Werk #13197: Add space as valid URL character

Component	Setup
Title	Add space as valid URL character
Date	Jan 19, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0p19 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

With Werk 13195 a stricter URL validation was introduced. In the original implementation the space character was not allowed. Unfortunately servicenames with spaces are not encoded properly and spaces used to work. Since this is also common behaviour and does not impose security risks the space is allowed again.

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