Remove electionDifficulty from chain parameters.

[abizjak]

Purpose

Election difficulty is no longer present in P6.

The JSON parsing done by the wallet turns out to just set it to null if it is not present, but that is "works by accident" solution.

Since the election difficulty is not actually used by the wallet, this PR removes it alltogether.

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.

[github-actions[bot]]

File	Coverage [0%]	:x:
ChainParameters.kt	0%	:x:

Total Project Coverage	0.95%	:x:

[czerwix]

looks good, please update changelog.md

[abizjak]

looks good, please update changelog.md

It is updated now.

[github-actions[bot]]

File	Coverage [0%]	:x:
ChainParameters.kt	0%	:x:

Total Project Coverage	0.95%	:x:

[github-actions[bot]]

File	Coverage [0%]	:x:
ChainParameters.kt	0%	:x:

Total Project Coverage	0.95%	:x:

[czerwix]

looks good, please update changelog.md

It is updated now. please add these changed under ###Changes in [Unreleased] part

[github-actions[bot]]

File	Coverage [0%]	:x:
ChainParameters.kt	0%	:x:

Total Project Coverage	0.94%	:x:

[github-actions[bot]]

File	Coverage [0%]	:x:
ChainParameters.kt	0%	:x:

Total Project Coverage	0.94%	:x: