fix(core-state): iterate over active delegates who have ranks

[rainydio]

Summary

Iterate over getActiveDelegates() because those have ranks.

Checklist

• Tests
• Ready to be merged

[codecov-commenter]

Codecov Report

Merging #4421 (b6b5203) into develop (76ecfe3) will decrease coverage by 1.32%.
The diff coverage is 50.00%.

@@             Coverage Diff             @@
##           develop    #4421      +/-   ##
===========================================
- Coverage    95.88%   94.56%   -1.33%     
===========================================
  Files          738      738              
  Lines        18360    18361       +1     
  Branches      2242     2242              
===========================================
- Hits         17605    17363     -242     
- Misses         554      799     +245     
+ Partials       201      199       -2     

Flag	Coverage Δ
functional	?
integration	9.53% <0.00%> (-0.01%)	⬇️
unit	94.48% <50.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ackages/core-state/src/dpos/dpos-previous-round.ts	92.85% <0.00%> (-7.15%)	⬇️
packages/core-state/src/round-state.ts	100.00% <100.00%> (ø)
...rc/migrations/20190307000000-drop-wallets-table.ts	0.00% <0.00%> (-100.00%)	⬇️
...c/migrations/20180305200000-create-rounds-table.ts	0.00% <0.00%> (-100.00%)	⬇️
...c/migrations/20180305300000-create-blocks-table.ts	0.00% <0.00%> (-100.00%)	⬇️
.../migrations/20180305100000-create-wallets-table.ts	0.00% <0.00%> (-100.00%)	⬇️
.../migrations/20201013000000-create-wallets-table.ts	0.00% <0.00%> (-100.00%)	⬇️
...igrations/20190626000000-enforce-chained-blocks.ts	0.00% <0.00%> (-100.00%)	⬇️
...grations/20201103000000-set-autovacuum-settings.ts	0.00% <0.00%> (-100.00%)	⬇️
...rations/20191003000000-migrate-vendor-field-hex.ts	0.00% <0.00%> (-100.00%)	⬇️
... and 24 more

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