fix(core-magistrate): use correct size for BridgechainUpdate asset buffer

[spkjp]

Summary

Checklist

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

[dated]

Fwiw I had fixed that in #3255 already

[codecov]

Codecov Report

Merging #3284 into develop will increase coverage by 35.61%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop   #3284       +/-   ##
===========================================
+ Coverage    29.78%   65.4%   +35.61%     
===========================================
  Files          431     431               
  Lines        12129   12129               
  Branches      1635    1635               
===========================================
+ Hits          3613    7933     +4320     
+ Misses        8490    4163     -4327     
- Partials        26      33        +7

Impacted Files	Coverage Δ
...rate-crypto/src/transactions/bridgechain-update.ts	27.77% <0%> (+27.77%)	⬆️
...crypto/src/transactions/bridgechain-resignation.ts	55.55% <0%> (+55.55%)	⬆️
...ages/core-api/src/handlers/transactions/methods.ts	100% <0%> (ø)	⬆️
...s/core-api/src/handlers/shared/schemas/block-id.ts	100% <0%> (ø)	⬆️
packages/core-tester-cli/src/logger.ts	100% <0%> (ø)	⬆️
.../core-api/src/handlers/transactions/transformer.ts	100% <0%> (ø)	⬆️
packages/core-api/src/handlers/peers/schema.ts	100% <0%> (ø)	⬆️
...ackages/core-api/src/handlers/locks/transformer.ts	100% <0%> (ø)	⬆️
...kages/core-api/src/handlers/transactions/routes.ts	100% <0%> (ø)	⬆️
...kages/core-tester-cli/src/commands/debug/verify.ts	100% <0%> (ø)	⬆️
... and 315 more

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