[winlog] Fix example processors config

[andrewkroh]

What does this PR do?

The event ID value in the conditions should be a string.

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.

[elasticmachine]

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

[elasticmachine]

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Build stats

• Start Time: 2021-09-23T16:52:40.140+0000

• Duration: 12 min 33 sec

• Commit: 5565342

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Test	Results
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Passed	2
Skipped	0
Total	2

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