Update submit finality proof weight formula (#981)

* updated weight formula for submit_finality_proof

* remove common prefix traces

* update docs

* single benchmark

* Re-generate weights.

* Update delivery transaction limits

Co-authored-by: Tomasz Drwięga <tomasz@parity.io>
Co-authored-by: Hernando Castano <hernando@hcastano.com>

bridges/modules/grandpa/src/lib.rs

@@ -46,6 +46,7 @@ use frame_support::{ensure, fail};
 use frame_system::{ensure_signed, RawOrigin};
 use sp_finality_grandpa::{ConsensusLog, GRANDPA_ENGINE_ID};
 use sp_runtime::traits::{BadOrigin, Header as HeaderT, Zero};
+use sp_std::convert::TryInto;
 
 #[cfg(test)]
 mod mock;
@@ -124,8 +125,8 @@ pub mod pallet {
 		/// If successful in verification, it will write the target header to the underlying storage
 		/// pallet.
 		#[pallet::weight(T::WeightInfo::submit_finality_proof(
-			justification.votes_ancestries.len() as u32,
-			justification.commit.precommits.len() as u32,
+			justification.commit.precommits.len().try_into().unwrap_or(u32::MAX),
+			justification.votes_ancestries.len().try_into().unwrap_or(u32::MAX),
 		))]
 		pub fn submit_finality_proof(
 			origin: OriginFor<T>,