[UDP] Fixing typo in listen_address for package

[P1llus]

What does this PR do?

Fixing a typo in the manifest.yml of the UDP package for listen address

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.

Closes #2668

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[elasticmachine]

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• Start Time: 2022-02-11T08:54:22.379+0000

• Duration: 22 min 43 sec

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Test	Results
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Passed	3
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Total	3

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