Make IncreaseIndentationForFirstPipeline the true default option for PipelineIndentationStyle option

[bergmeister]

PR Summary

The documentation and the setting default for the PipelineIndentationStyle option is IncreaseIndentationForFirstPipeline but the defaults used in the setting files and in some places in code were actually inconsistent. This PR makes them consistent.
The default was determined based on this Twitter poll.

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Change is not breaking
• Make sure all .cs, .ps1 and .psm1 files have the correct copyright header
• Make sure you've added a new test if existing tests do not effectively test the code changed and/or updated documentation
• This PR is ready to merge and is not Work in Progress.
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