change StartBlockHeightAndRewards from parent to current (#31781)

runtime/src/bank.rs

@@ -878,8 +878,8 @@ impl AbiExample for OptionalDropCallback {
 
 #[derive(AbiExample, Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub(crate) struct StartBlockHeightAndRewards {
-    /// the block height of the parent of the slot at which rewards distribution began
-    pub(crate) parent_start_block_height: u64,
+    /// the block height of the slot at which rewards distribution began
+    pub(crate) start_block_height: u64,
     /// calculated epoch rewards pending distribution
     pub(crate) calculated_epoch_stake_rewards: Arc<StakeRewards>,
 }

runtime/src/serde_snapshot/tests.rs

@@ -719,7 +719,7 @@ mod test_bank_serialize {
 
     // This some what long test harness is required to freeze the ABI of
     // Bank's serialization due to versioned nature
-    #[frozen_abi(digest = "8aBQnNxnfKDxGEmMwaq9uLeMh3fw5sKsMGZBsCp15Dmv")]
+    #[frozen_abi(digest = "9BucA5MtPMNNUjADyV27vNgzvDy1RqCLH2gRq5NEuDEF")]
     #[derive(Serialize, AbiExample)]
     pub struct BankAbiTestWrapperNewer {
         #[serde(serialize_with = "wrapper_newer")]