refactor(core-transactions): use findByPublicKey to set both publickey and address on the multisig wallet

[air1one]

Summary

Set the public key on the wallet when applying multisignature registration transaction. Before using findByAddress, it would only set the address, now using findByPublicKey it sets both address and public key.

Checklist

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

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (2.6@b88806f). Click here to learn what that means.
The diff coverage is 80%.

@@          Coverage Diff           @@
##             2.6    #3498   +/-   ##
======================================
  Coverage       ?   66.15%           
======================================
  Files          ?      439           
  Lines          ?    12465           
  Branches       ?     1711           
======================================
  Hits           ?     8246           
  Misses         ?     4185           
  Partials       ?       34

Impacted Files	Coverage Δ
.../core-transactions/src/handlers/multi-signature.ts	68.62% <80%> (ø)

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