fix proposal prefix

[wangchao0222]

Description

Solve the problem that some user tokens are not unlocked after the proposal ends

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• [x] Bug fix (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)
• [ ] This change requires a documentation update

Brief of your solution

Please describe your solution to solve the issue or feature request.

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

[codecov-commenter]

Codecov Report

Merging #341 (08d49c6) into master (191d55e) will decrease coverage by 0.03%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #341      +/-   ##
==========================================
- Coverage   45.65%   45.61%   -0.04%     
==========================================
  Files         139      139              
  Lines       12346    12346              
==========================================
- Hits         5636     5632       -4     
- Misses       5557     5559       +2     
- Partials     1153     1155       +2     

Impacted Files	Coverage Δ
bcs/consensus/xpoa/xpoa.go	52.28% <0.00%> (-1.02%)	:arrow_down:
bcs/consensus/tdpos/schedule.go	42.98% <0.00%> (-0.91%)	:arrow_down:

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