Fix the P11 genesis hash calculation.

[td202]

Purpose

Fix a bug in the calculation of the P11 genesis hash in the genesis creator tool.

Changes

• Include the P11 protocol version in the computation of the genesis hash.

Checklist

• My code follows the style of this project.
• The code compiles without warnings.
• I have performed a self-review of the changes.
• I have documented my code, in particular the intent of the
  hard-to-understand areas.
• (If necessary) I have updated the CHANGELOG.