network_traffic: fix type of real_ip_header option for HTTP data stream

[efd6]

What does this PR do?

Fixes type of real_ip_header option for HTTP data stream.

The backing configuration expects a string, not a bool.

https://github.com/elastic/beats/blob/1f1868d6b1c98d9b9b995e6ffbb3772b8ee293b1/packetbeat/protos/http/config.go#L31

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

• [ ]

How to test this PR locally

Related issues

Screenshots

[elasticmachine]

💚 Build Succeeded

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

Expand to view the summary

Build stats

• Start Time: 2023-02-23T03:59:49.162+0000

• Duration: 70 min 23 sec

Test stats 🧪

Test	Results
Failed	0
Passed	173
Skipped	0
Total	173

🤖 GitHub comments

Expand to view the GitHub comments

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

• /test : Re-trigger the build.

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚 3.432
Classes	100.0% (0/0)	💚 3.432
Methods	71.875% (46/64)	👎 -19.277
Lines	100.0% (0/0)	💚 8.592
Conditionals	100.0% (0/0)	💚

[efd6]

/test

[elasticmachine]

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

[elasticmachine]

Package network_traffic - 1.9.1 containing this change is available at https://epr.elastic.co/search?package=network_traffic