Fix Mii editor color selection guard

[patchzyy]

Summary

• Fix eye and eyebrow color selection in the Mii editor when the selected color index matches the current feature type.
• Keep no-op behavior only for the currently selected color.

Fixes #258.
Fixes #262.

Validation

• dotnet test WheelWizard.Test/WheelWizard.Test.csproj

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