fix(core-transactions): undefined pool variable

[rainydio]

Summary

Undefined pool variable was suppressed by @ts-ignore and I missed it. Wallet repository can be referenced by this.walletRepository.

Checklist

• Ready to be merged

[codecov]

Codecov Report

Merging #3535 into 3.0 will decrease coverage by 37.69%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              3.0   #3535       +/-   ##
==========================================
- Coverage   47.52%   9.82%   -37.70%     
==========================================
  Files         548     548               
  Lines       13861   13861               
  Branches     1902    1902               
==========================================
- Hits         6587    1362     -5225     
- Misses       7245   12476     +5231     
+ Partials       29      23        -6     

Impacted Files	Coverage Δ
packages/crypto/src/enums.ts	0.00% <0.00%> (-100.00%)	⬇️
packages/core-p2p/src/schemas.ts	0.00% <0.00%> (-100.00%)	⬇️
packages/crypto/src/constants.ts	0.00% <0.00%> (-100.00%)	⬇️
packages/core-cli/src/contracts.ts	0.00% <0.00%> (-100.00%)	⬇️
packages/core-p2p/src/constants.ts	0.00% <0.00%> (-100.00%)	⬇️
packages/crypto/src/crypto/hash.ts	0.00% <0.00%> (-100.00%)	⬇️
packages/crypto/src/crypto/slots.ts	0.00% <0.00%> (-100.00%)	⬇️
packages/crypto/src/utils/base58.ts	0.00% <0.00%> (-100.00%)	⬇️
packages/crypto/src/utils/bignum.ts	0.00% <0.00%> (-100.00%)	⬇️
packages/core-cli/src/application.ts	0.00% <0.00%> (-100.00%)	⬇️
... and 261 more

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