windows: update tests expectations to match processor behaviour

[efd6]

What does this PR do?

This updates the tests expectations to match the bahaviour of ES ingest processors.

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

• This unfortunately requires dropping support for 7.x stacks. The alternative would be to reimplement the registered_domain processor behaviour for 7.x which I think would be unreasonably brittle.

How to test this PR locally

Related issues

• Fixes [windows] sysmon/operational registered_domain test failures #5958

Screenshots

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Build stats

• Start Time: 2023-04-23T23:31:07.777+0000

• Duration: 17 min 16 sec

Test stats 🧪

Test	Results
Failed	0
Passed	129
Skipped	0
Total	129

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (4/4)	💚
Files	87.5% (7/8)	👎 -12.5
Classes	87.5% (7/8)	👎 -12.5
Methods	83.516% (76/91)	👎 -16.484
Lines	92.748% (5103/5502)	👎 -2.535
Conditionals	100.0% (0/0)	💚

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

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Package windows - 1.20.0 containing this change is available at https://epr.elastic.co/search?package=windows