test(systemtests): fix iavl nil

[julienrbrt]

Description

After this PR all systemtests should pass in v1 and v2 🙌🏾 🚀

Closes: #22753

PR that attempts to fix the nil tree on a app while closing.

ref: https://github.com/cosmos/cosmos-sdk/actions/runs/12294880689/job/34310582852

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[julienrbrt]

Closing this as I wasn't able to successfully debug it before my holidays. It's free to pick up by anyone, otherwise I'll just get back to it once I am back.