fix(core-transactions): apply genesis wallet exception to lastForgedBlocks

[air1one]

Summary

Fix "genesis wallet" case that was correctly handled for forgedBlocks but not for lastForgedBlocks.

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

Merging #3440 into develop will decrease coverage by <.01%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop    #3440      +/-   ##
===========================================
- Coverage    66.17%   66.16%   -0.01%     
===========================================
  Files          439      439              
  Lines        12454    12456       +2     
  Branches      1706     1707       +1     
===========================================
+ Hits          8241     8242       +1     
- Misses        4179     4180       +1     
  Partials        34       34

Impacted Files	Coverage Δ
...transactions/src/handlers/delegate-registration.ts	41.42% <0%> (-1.22%)	⬇️
packages/core-transaction-pool/src/storage.ts	100% <0%> (+2.5%)	⬆️

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