replace HttpOnly=true with HttpOnly

[DDJavierSantos]

Description

Replace HttpOnly=true with HttpOnly in the vulnerability tests for HttpOnly Cookie

Motivation

HttpOnly is meant to be used as a flag, not as name value pair

Workflow

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2. Follow the style guidelines of this project (See how to easily lint the code)
3. Work on you PR until the CI passes (if something not related to your task is failing, you can ignore it)
4. Mark it as ready for review

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Reviewer checklist

• Check what scenarios are modified. If needed, add the relevant label (run-parametric-scenario, run-profiling-scenario...). If this PR modifies any system-tests internal, then add the run-all-scenarios label (more info).
• CI is green
  • If not, failing jobs are not related to this change (and you are 100% sure about this statement)
• if any of build-some-image label is present
  1. is the image labl have been updated ?
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