Werk #15454: Fix color of Perf-O-Meter for CPU utilization

Component	Setup
Title	Fix color of Perf-O-Meter for CPU utilization
Date	Nov 16, 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 2.2.0p15 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

The color for the Perf-O-Meter of the CPU utilization lead to hardly readable text in the light theme of Checkmk. This is now fixed.

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