Attempt to remove the where bounds in arithmetic. (#7933)

* Attempt to remove the where bounds.

* Fix further and further.

* Format better.

* Update primitives/npos-elections/src/lib.rs

* fix build

* remove unused

substrate/frame/staking/src/offchain_election.rs

@@ -29,7 +29,7 @@ use sp_npos_elections::{
 	ExtendedBalance, CompactSolution,
 };
 use sp_runtime::{
-	offchain::storage::StorageValueRef, traits::TrailingZeroInput, PerThing, RuntimeDebug,
+	offchain::storage::StorageValueRef, traits::TrailingZeroInput, RuntimeDebug,
 };
 use sp_std::{convert::TryInto, prelude::*};
 
@@ -326,10 +326,7 @@ pub fn prepare_submission<T: Config>(
 ) -> Result<
 	(Vec<ValidatorIndex>, CompactAssignments, ElectionScore, ElectionSize),
 	OffchainElectionError,
->
-where
-	ExtendedBalance: From<<OffchainAccuracy as PerThing>::Inner>,
-{
+> {
 	// make sure that the snapshot is available.
 	let snapshot_validators =
 		<Module<T>>::snapshot_validators().ok_or(OffchainElectionError::SnapshotUnavailable)?;