fix(apigateway): remove indentation in debug_mode

[heitorlessa]

Issue #, if available: #972

Description of changes:

This PR removes additional indentation when using debug_mode. While effective for local development it creates additional log events for CloudWatch Logs incurring additional charges; this breaks our tenets hence we revert.

Before

After

Checklist

• Meet tenets criteria
• Update tests
• Update docs
• PR title follows conventional commit semantics

Breaking change checklist

RFC issue #:

• Migration process documented
• Implement warnings (if it can live side by side)

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

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View rendered docs/core/event_handler/api_gateway.md

[codecov-commenter]

Codecov Report

Merging #987 (916b7e7) into develop (ffa4a35) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #987      +/-   ##
===========================================
- Coverage    99.96%   99.96%   -0.01%     
===========================================
  Files          119      119              
  Lines         5337     5335       -2     
  Branches       608      607       -1     
===========================================
- Hits          5335     5333       -2     
  Partials         2        2              

Impacted Files	Coverage Δ
aws_lambda_powertools/event_handler/api_gateway.py	100.00% <100.00%> (ø)

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