all: cleanup code that supported forks

[altergui]

since we're using chain bumps now, and the blockstore of LTS is pruned, we don't need forks anymore.

[altergui]

fixes #1326

[coveralls]

Pull Request Test Coverage Report for Build 9496539259

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 15 unchanged lines in 7 files lost coverage.
• Overall coverage decreased (-0.05%) to 60.901%

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Files with Coverage Reduction	New Missed Lines	%
cmd/end2endtest/account.go	1	66.43%
api/accounts.go	2	54.42%
apiclient/account.go	2	38.89%
vochain/appsetup.go	2	55.45%
vochain/state/account.go	2	67.08%
vochain/transaction/election_tx.go	2	61.54%
vochain/indexer/indexer.go	4	68.27%
<!--	Total:	15		-->

Totals
Change from base Build 9495839404:	-0.05%
Covered Lines:	16051
Relevant Lines:	26356

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💛 - Coveralls