fix: bundle deduplication calculation

[florinMiro]

The current logic was reporting the ratio of files missing from the bundle which is the oposite of the deduplication ratio.

For a bundle with 4 files and 1 files missing.

• The bundle deduplication ratio is 75%.
• The ratio of files missing from the bundle is 25%

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

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✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

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[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues
✅	Secrets	0	0	0	0	0 issues

💻 Catch issues earlier using the plugins for VS Code, JetBrains IDEs, Visual Studio, and Eclipse.

[snyk-pr-review-bot]

PR Reviewer Guide 🔍

🧪 PR contains tests

🔒 No security concerns identified

⚡ No major issues detected

📚 Repository Context Analyzed This review considered 6 relevant code sections from 5 files (average relevance: 1.00) bundle/bundle_manager.go (lines 1-252) bundle/bundle.go (lines 1-184) internal/analysis/mocks/analysis.go (lines 1-88) internal/deepcode/client.go (lines 1-269) scan.go (2 segments, lines 250-488)

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