fix unfairness on proof size check estimation #12957

Job	Run time
set-tags	5s
Check editorconfig	8s
check-links	49s
Check Cargo.toml files format	4s
check-copyright	6s
Check with EsLint	30s
Check with Prettier	23s
build	11m 12s
cargo-clippy	3m 7s
Check 'forbid-evm-reentrancy'	14s
Check with rustfmt	15s
rust-test	16m 13s
Check WASM runtimes with Twiggy	3m 2s
dev-test (moonbase, 1)	2m 29s
dev-test (moonbase, 2)	2m 36s
docker-moonbeam	59s
dev-test (moonbase, 3)	2m 24s
dev-test (moonbase, 4)	2m 36s
dev-test (moonriver, 1)	1m 40s
dev-test (moonriver, 2)	1m 41s
dev-test (moonriver, 3)	1m 42s
dev-test (moonriver, 4)	1m 35s
dev-test (moonbeam, 1)	1m 41s
dev-test (moonbeam, 2)	1m 40s
dev-test (moonbeam, 3)	1m 45s
dev-test (moonbeam, 4)	1m 47s
typescript-tracing-tests	0s
lazy-loading-tests	0s
chopsticks-upgrade-test	0s
zombie_upgrade_test	0s
	1h 0m 43s

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