Remove deletion of TransactionStatusIndex entries (solana-labs#34023)

These entries are legacy code at this point; however, older release
branches require these entries to be present. Also, while it would be
nice to clean up these entries immediately, they only occupy a small
amount of space so having them linger a little longer isn't a big deal.

ledger/src/blockstore.rs

@@ -2278,13 +2278,9 @@ impl Blockstore {
         if let Some(highest_primary_index_slot) = *w_highest_primary_index_slot {
             if oldest_slot > highest_primary_index_slot {
                 *w_highest_primary_index_slot = None;
-                self.transaction_status_index_cf.delete(0)?;
-                self.transaction_status_index_cf.delete(1)?;
+                self.db.set_clean_slot_0(true);
             }
         }
-        if w_highest_primary_index_slot.is_none() {
-            self.db.set_clean_slot_0(true);
-        }
         Ok(())
     }