Clear error type

[boundless-forest]

// Used to record the external costs in the evm through the StackState implementation
let maybe_weight_info =
	WeightInfo::new_from_weight_limit(weight_limit, proof_size_base_cost).map_err(
		|_| RunnerError {
			error: Error::<T>::Undefined,
			weight,
		},
	)?;

The weight_limit.proof_size() < proof_size_base_cost case deserves a better error message with clear meaning.