Fix abi issue on custom tx form

[neokry]

Description

Fixes an issue where custom ABI could not be used in the transaction builder

Motivation & context

Code review

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• [ ] I have done a self-review of my own code
• [ ] Any new and existing tests pass locally with my changes
• [ ] My changes generate no new warnings (lint warnings, console warnings, etc)

[vercel[bot]]

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