Drop default_on_eof attribute from Reward struct

(cherry picked from commit 33718e5fb4)

transaction-status/src/lib.rs

@@ -339,7 +339,6 @@ pub struct Reward {
     pub lamports: i64,
     pub post_balance: u64, // Account balance in lamports after `lamports` was applied
     pub reward_type: Option<RewardType>,
-    #[serde(deserialize_with = "default_on_eof")]
     pub commission: Option<u8>, // Vote account commission when the reward was credited, only present for voting and staking rewards
 }