fix(rpc/otterscan): set fullblock.tx_count with block's (#10421)

Signed-off-by: jsvisa <delweng@gmail.com>

crates/rpc/rpc/src/otterscan.rs

@@ -233,7 +233,11 @@ where
                 OtsTransactionReceipt { receipt, timestamp }
             })
             .collect();
-        Ok(OtsBlockTransactions { fullblock: block.inner.into(), receipts })
+
+        // use `transaction_count` to indicate the paginate information
+        let mut block = OtsBlockTransactions { fullblock: block.inner.into(), receipts };
+        block.fullblock.transaction_count = tx_len;
+        Ok(block)
     }
 
     /// Handler for `searchTransactionsBefore`