feat!: don't "fix" licenses if not needed #995

[Rohankaf]

Previously, the licenses_fixup function would always "fix" licenses even if they were already compliant. With CycloneDX 1.7, this is no longer needed.

This change:

• Leaves compliant components untouched.
• Moves only mixed licenses (expression + named) to evidence.
• Avoids unnecessary modifications to license data.

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• fixes #995