fix(signer): fix signer key balance metric

[dancoombs]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 58.72%. Comparing base (f48c3ba) to head (12df3a4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/builder/src/signer/mod.rs	0.00%	8 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
crates/builder/src/signer/mod.rs	0.00% <0.00%> (ø)

Flag	Coverage Δ
unit-tests	58.72% <0.00%> (-0.02%)	⬇️

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Components	Coverage Δ
rundler binary	0.00% <ø> (ø)
builder	63.30% <0.00%> (-0.07%)	⬇️
dev	∅ <ø> (∅)
pool	66.73% <ø> (ø)
provider	20.87% <ø> (ø)
rpc	25.87% <ø> (ø)
sim	76.65% <ø> (ø)
tasks	∅ <ø> (∅)
types	67.83% <ø> (ø)
utils	29.38% <ø> (ø)