chore: avoid extra allocation

[kylezs]

Just noticed this when I was debugging

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (3d1e872) 73% compared to head (57e3642) 73%.
Report is 3 commits behind head on main.

Files	Patch %	Lines
engine/multisig/src/client.rs	50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #4542   +/-   ##
=====================================
- Coverage     73%     73%   -0%     
=====================================
  Files        401     401           
  Lines      68206   68184   -22     
  Branches   68206   68184   -22     
=====================================
- Hits       49611   49587   -24     
- Misses     15963   15973   +10     
+ Partials    2632    2624    -8     

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