fix: parseUnits bug with 0 units

[Dhaiwat10]

• Closes bn library bugs parsing when you're using units / precision zero #3316

Release notes

In this release, we:

• Fixed a bug where bn.parseUnits wouldn't work as expected with units = 0

Summary

This PR fixes a bug in bn.parseUnits, as a follow-up of #3300.

Checklist

• All changes are covered by tests (or not applicable)
• All changes are documented (or not applicable)
• I reviewed the entire PR myself (preferably, on GH UI)
• I described all Breaking Changes (or there's none)

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[codspeed-hq]

CodSpeed Performance Report

Merging #3320 will improve performances by 17.21%

_{Comparing dp/fix-parse-units (ee759d7) with master (85072f7)}

Summary

⚡ 3 improvements
✅ 15 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	dp/fix-parse-units	Change
⚡	should successfully get transaction cost estimate for a batch transfer (x10 times)	26.8 ms	24.3 ms	+10.1%
⚡	should successfully get transaction cost estimate for a single contract call (x10 times)	27.7 ms	25 ms	+10.74%
⚡	should successfully get transaction cost estimate for a single transfer (x10 times)	21.2 ms	18.1 ms	+17.21%

[github-actions]

Coverage Report:

Lines	Branches	Functions	Statements
76.07%(+0.01%)	69.98%(-0.01%)	75.05%(+0%)	76.2%(+0.01%)

Changed Files:

Ok	File (✨=New File)	Lines	Branches	Functions	Statements
🔴	packages/account/src/providers/transaction-request/transaction-request.ts	88.57% (+0%)	76.71% (-1.37%)	84% (+0%)	88.81% (+0%)
🔴	packages/math/src/bn.ts	88.57% (+0.34%)	87.83% (+0.33%)	80% (+0%)	88.57% (+0.34%)