money/integration: add missing import for `darkfi_sdk::blockchain::expected_reward`

src/contract/money/tests/integration.rs

@@ -18,6 +18,7 @@
 
 use darkfi::Result;
 use darkfi_contract_test_harness::{init_logger, Holder, TestHarness};
+use darkfi_sdk::blockchain::expected_reward;
 
 #[test]
 fn money_integration() -> Result<()> {