Visualisation not correctly handling colors for "inverted" metrics

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# Bug

## Expected Behavior

WHEN

A map contains metrics with the direction 1 property (indicating higher is better, e.g. coverage)

THEN

The area, height and color metrics correctly adjust to this, by inverting their scale

## Actual Behavior

Only the area and height metrics invert their scale, the colors stay the same.

## Screenshots

Map with direction -1, looks as expected

Same map with direction 1, height is correctly changed but color stays the same (area was selected as unary but works as expected)

## Steps to Reproduce the Problem
1. load attached maps
2. activate exampleWithDirection-1 map, everything looks as expected, higher number means larger, higher and redder
3. activate exampleWithDirection1 map, area and height are correctly inverted but the color does not

## Specifications
- is released in [online-demo](https://maibornwolff.github.io/codecharta/visualization/app/index.html?file=codecharta.cc.json.gz&file=codecharta_analysis.cc.json.gz¤tFilesAreSampleFiles=true): yes
- CodeCharta Version: 1.135.2
- OS: -
- Browser: all

Start by reproducing the issue in the linked online demo with the direction 1 map, then trace the visualization code that computes color scales alongside area and height scales. Done means color metrics invert their scale for direction 1 while retaining the existing behavior for direction -1.

Written by the indexing model from the issue text.