Werk #14940: Fix hex to rgb color conversion

Component	Metrics system
Title	Fix hex to rgb color conversion
Date	Jan 30, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p21 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Hex to RGB conversion has now been fixed to work for 3-digits HEX

If you had an error showing "Invalid color specification: #100" in the graph, this will be fixed by this werk.

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