fix: sync finish bug

[lc3091]

Proposed changes in this pull request

fix sync finish bug

Type

• Bug fix: (Link to the issue #{issue No.})
• Feature (Non-breaking change)
• Feature (Breaking change)
• Documentation Improvement

Checklist

Write a small comment explaining if its N/A (not applicable)

• Read the CONTRIBUTION.
• All the tests are passing after the introduction of new changes.
• Added tests respective to the part of code I have written.
• Added proper documentation where ever applicable.
• Code has been written according to Golang-Style-Guide

Extra information

Any extra information related to this pull request.

[codecov]

Codecov Report

Merging #825 into release/v1.3.1 will increase coverage by 0.03%.
The diff coverage is 0%.

@@                Coverage Diff                 @@
##           release/v1.3.1     #825      +/-   ##
==================================================
+ Coverage           37.03%   37.06%   +0.03%     
==================================================
  Files                 241      241              
  Lines               33963    33953      -10     
==================================================
+ Hits                12577    12584       +7     
+ Misses              18709    18692      -17     
  Partials             2677     2677

Flag	Coverage Δ
#unittests	37.06% <0%> (+0.03%)	⬆️

Impacted Files	Coverage Δ
consensus/dpos/dpos_impl.go	7.23% <0%> (-0.04%)	⬇️
consensus/pov/pov_sync.go	31.02% <0%> (-0.52%)	⬇️
consensus/pov/pov_chain.go	42.82% <0%> (+1.25%)	⬆️

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