Fix http invert without explicit default

[AlexandreYang]

What does this PR do?

Fix http invert without explicit default.

Motivation

Inverting the default defined in http.py for boolean seems semantically more correct when invert is used in remapper.

However, when using HTTP_CONFIG_REMAPPER, it's better to provide an explicit default along with invert.

Review checklist (to be filled by reviewers)

• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have changelog/ and integration/ labels attached
• Feature or bugfix must have tests
• Git history must be clean
• If PR adds a configuration option, it must be added to the configuration file.

[therve]

Makes sense.