Fix vote counting in partition_recent_disputes() (code review feedb…

…ack)

node/core/provisioner/src/disputes/mod.rs

@@ -193,9 +193,8 @@ fn partition_recent_disputes(
 		match onchain.get(&(session_index, candidate_hash)) {
 			Some(d) => {
 				// handle double voting here - if a validator has voted both `for` and `against` at the same time for a dispute - ignore its vote
-				let double_votes =
-					(d.validators_for.clone() & d.validators_against.clone()).count_ones() * 2;
-				if d.validators_for.count_ones() + d.validators_against.count_ones() - double_votes >=
+				// XOR-ing `for` and `against` gives exactly that
+				if (d.validators_for.clone() ^ &d.validators_against).count_ones() >=
 					supermajority_threshold(d.validators_for.len())
 				{
 					partitioned.can_conclude_onchain.push((session_index, candidate_hash));