restore the IBC tx gas cost to match v0.31.6 #7893

Job	Run time
build-wasm (ubuntu-latest, v2, 2.4.0)	4m 16s
namada-release (ubuntu-latest, 2.4.0, ABCI Release build)	9m 49s
test-unit (ubuntu-latest, nightly-2024-02-10, 2.4.0, ABCI)	19m 22s
test-wasm (ubuntu-latest, v2, nightly-2024-02-10, 2.4.0)	8m 6s
test-integration (ubuntu-latest, nightly-2024-02-10, 2.4.0, ABCI)	6m 57s
upload-wasm (ubuntu-latest, v2, nightly-2024-02-10, 2.4.0)	22s
run-benchmarks (ubuntu-latest, nightly-2024-02-10, 2.4.0, ABCI)	26m 24s
namada-e2e (ubuntu-latest, nightly-2024-02-10, 2.4.0, 0.37.2, 1.7.4-namada-beta7, 0)	17m 36s
namada-e2e (ubuntu-latest, nightly-2024-02-10, 2.4.0, 0.37.2, 1.7.4-namada-beta7, 1)	22m 6s
namada-e2e (ubuntu-latest, nightly-2024-02-10, 2.4.0, 0.37.2, 1.7.4-namada-beta7, 2)	24m 3s
namada-e2e (ubuntu-latest, nightly-2024-02-10, 2.4.0, 0.37.2, 1.7.4-namada-beta7, 3)	22m 37s
	2h 41m 38s

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