fix(tm2/rpc): prevent index out of bounds panic

[davd-gzl]

https://hackmd.io/@snwSRExvRiK7iENYqPrasw/B1NnYPcvZg

[Gno2D2]

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
tm2/pkg/bft/rpc/core/tx.go	50.00%	0 Missing and 1 partial ⚠️

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