consensus: fix missing block header error in vote verification, fix #1850

[gzliudan]

Proposed changes

This PR eliminates the following errors which are produced by PR #1850:

ERROR[12-23|23:05:41.035] [VerifyVoteMessage] Fail to get epochInfo when verifying vote message! blockNum=76,854,127 blockHash=147610..416730 voteHash=4d0a5c..9e7fcf voteGapNumber=76,852,350 err="[getEpochSwitchInfo] can not find header from db hash 0x147610f021c9b4b5fda55239a807181c52c864a3b25d02ba0b9785105a416730"
ERROR[12-23|23:05:41.035] [Vote] Verify BFT Vote                   error="[getEpochSwitchInfo] can not find header from db hash 0x147610f021c9b4b5fda55239a807181c52c864a3b25d02ba0b9785105a416730"

ERROR[12-23|23:05:43.380] [VerifyVoteMessage] Fail to get epochInfo when verifying vote message! blockNum=76,854,128 blockHash=6eaf17..9feb10 voteHash=54c559..dafbde voteGapNumber=76,852,350 err="[getEpochSwitchInfo] can not find header from db hash 0x6eaf1777cab5f487090909afd5eabf15dd103413a833a305b1b8970d349feb10"
ERROR[12-23|23:05:43.380] [Vote] Verify BFT Vote                   error="[getEpochSwitchInfo] can not find header from db hash 0x6eaf1777cab5f487090909afd5eabf15dd103413a833a305b1b8970d349feb10"

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
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• Regular KTLO or any of the maintaince work. e.g code style
• CICD Improvement

Impacted Components

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• Consensus
• Account
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• Geth
• Smart Contract
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Checklist

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• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
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• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
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