Fix inversion in --include-stake parser + print "stake" field even when there is no stake (do not hide stake absence)

[smelc]

Changelog

- description: |
    Fixed `--include-stake` behavior in `query drep-state`
# uncomment types applicable to the change:
  type:
  # - feature        # introduces a new feature
  - breaking       # the API has changed in a breaking way
  # - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
  # - improvement    # QoL changes e.g. refactoring
  - bugfix         # fixes a defect
  # - test           # fixes/modifies tests
  # - maintenance    # not directly related to the code
  # - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...

Context

Fixes #623

How to trust this PR

I've tested the behavior of this PR on this branch of cardano-node: see the HEAD of https://github.com/IntersectMBO/cardano-node/commits/smelc/test-of-cli-pull-698/

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• NA New tests are added if needed and existing tests are updated. See Running tests for more details
• Self-reviewed the diff

[smelc]

This is one of the two important bits of this PR: the arguments to Opt.flag are as follows:

1. The default value
2. The modified value

Here the two values were inverted. This change fixes that.

[Jimbo4350]

LGTM! One minor comment.