fix(mobile): remove redundant database backup exclusions

[iscekic]

Summary

• Remove three redundant afpurchases.db exclusions from Android backup rules.
• Preserve the shared-preference allowlist and all existing shared-preference exclusions.
• Fix :app:lintVitalRelease failures in the release run.

Verification

• No manual device tests ran; this change only removes invalid XML entries.
• The native Android release build was not rerun.

Visual Changes

N/A

Reviewer Notes

• Databases remain excluded because each backup section includes only sharedpref.
• Passed: pnpm format, pnpm typecheck, pnpm lint, and pnpm check:unused from apps/mobile.
• Passed: XML syntax validation, XPath assertions for preserved allowlists, and git diff --check.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• apps/mobile/plugins/backup/kilo_backup_rules.xml
• apps/mobile/plugins/backup/kilo_data_extraction_rules.xml

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_{Review guidance: REVIEW.md from base branch main}