Fix filters in linux/services

[fearful-symmetry]

What does this PR do?

Fixes #4882

This properly formats the state_filter and pattern_filter fields.

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.

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Pinging @elastic/elastic-agent (Team:Elastic-Agent)

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Build stats

• Start Time: 2023-01-04T20:59:13.891+0000

• Duration: 18 min 58 sec

Test stats 🧪

Test	Results
Failed	0
Passed	25
Skipped	0
Total	25

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💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

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Build stats

• Start Time: 2023-01-04T20:58:13.875+0000

• Duration: 19 min 58 sec

Test stats 🧪

Test	Results
Failed	0
Passed	25
Skipped	0
Total	25

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To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚
Classes	100.0% (0/0)	💚
Methods	51.515% (17/33)	👍 26.515
Lines	100.0% (0/0)	💚
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Package linux - 0.6.9 containing this change is available at https://epr.elastic.co/search?package=linux