fix condition on community_id processor

[gsantoro]

What does this PR do?

Fix a if condition on the community_id processor on one of the ingest pipeline of the Traefik integration.

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.

Author's Checklist

• Check that ingest pipeline tests are passing

How to test this PR locally

cd packages/traefik && elastic-package test pipeline -v

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2022-08-26T11:01:51.274+0000

• Duration: 18 min 47 sec

Test stats 🧪

Test	Results
Failed	0
Passed	21
Skipped	0
Total	21

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (3/3)	💚 2.89
Classes	100.0% (3/3)	💚 2.89
Methods	100.0% (26/26)	💚 10.377
Lines	97.696% (212/217)	👍 5.948
Conditionals	100.0% (0/0)	💚

[muthu-mps]

LGTM!