fix: return correct types in wasm tests and add expected err (backport #5883)

[mergify]

This is an automatic backport of pull request #5883 done by Mergify.
Cherry-pick of 6b11895 has failed:

On branch mergify/bp/08-wasm/release/v0.2.x+ibc-go-v8.2.x-wasmvm-v2.0.x/pr-5883
Your branch is up to date with 'origin/08-wasm/release/v0.2.x+ibc-go-v8.2.x-wasmvm-v2.0.x'.

You are currently cherry-picking commit 6b118957.
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	both modified:   modules/light-clients/08-wasm/types/querier_test.go

no changes added to commit (use "git add" and/or "git commit -a")

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[damiannolan]

Think we also need: #5878

Not sure why it hasn't popped with mergify yet!

[damiannolan]

LGTM!