Remove 3 unused parameters from ConsensusConstants

[matt-o-how]

soft_fork2_height, soft_fork4_height, and hard_fork_fix_height are now no longer in use and can be safely removed

[coveralls-official]

Pull Request Test Coverage Report for Build 10598784102

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 83.891%

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Totals
Change from base Build 10585347523:	0.0%
Covered Lines:	12301
Relevant Lines:	14663

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💛 - Coveralls

[arvidn]

this looks good. it makes me a bit nervous to leave the line ending commits in here though. If this PR lands with a merge commit, it will ruin our history for those files.

[arvidn]

I'll just squash and merge