Fixup deserialize_bs58_transaction (bp #10171)

[mergify]

This is an automated backport of pull request #10171 done by Mergify

Cherry-pick of 12a3b1b has failed:

On branch mergify/bp/v1.1/pr-10171
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Changes to be committed:

	modified:   core/tests/rpc.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)

	both modified:   core/src/rpc.rs

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[codecov]

Codecov Report

Merging #10177 into v1.1 will increase coverage by 0.0%.
The diff coverage is 86.3%.

@@          Coverage Diff           @@
##            v1.1   #10177   +/-   ##
======================================
  Coverage   80.5%    80.6%           
======================================
  Files        288      288           
  Lines      66080    66085    +5     
======================================
+ Hits       53241    53310   +69     
+ Misses     12839    12775   -64