fix : Accepting a RefreshProposal should clear all pending unsigned RefreshProposals

[1xstj]

Summary of changes
Changes introduced in this pull request:

• Resolves [BUG] Accepting a RefreshProposal should clear all pending unsigned RefreshProposals #724

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (d5512ea) 18.79% compared to head (4cec5cf) 18.47%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #725      +/-   ##
==========================================
- Coverage   18.79%   18.47%   -0.31%     
==========================================
  Files          80       80              
  Lines        5958     5969      +11     
==========================================
- Hits         1119     1102      -17     
- Misses       4839     4867      +28     

Files	Coverage Δ
pallets/dkg-proposal-handler/src/lib.rs	48.82% <ø> (-7.08%)	⬇️
pallets/dkg-proposal-handler/src/impls.rs	75.41% <90.91%> (-0.59%)	⬇️

... and 2 files with indirect coverage changes

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[drewstone]

LG just need to fix CI