[ti_misp] fix the fingerprint processor for the attributes pipeline.

[leandrojmp]

What does this PR do?

This PR fix the fingerprint processor on the MISP Attributes Ingest Pipeline, it was making a reference to a field that does not exist in the document.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Related issues

• Closes [ti_misp] ti_misp threat attributes pipeline duplicating events. #6686

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• Start Time: 2023-06-27T22:38:20.248+0000

• Duration: 14 min 6 sec

Test stats 🧪

Test	Results
Failed	0
Passed	15
Skipped	0
Total	15

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[efd6]

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (2/2)	💚
Classes	100.0% (2/2)	💚
Methods	100.0% (30/30)	💚
Lines	86.536% (617/713)	❕
Conditionals	100.0% (0/0)	💚

[efd6]

Thanks

[elasticmachine]

Package ti_misp - 1.16.2 containing this change is available at https://epr.elastic.co/search?package=ti_misp