fix compilation

base_layer/core/src/proof_of_work/monero_rx.rs

@@ -94,7 +94,7 @@ fn monero_difficulty_calculation(header: &BlockHeader) -> Result<Difficulty, Mer
         let hash = vm.calculate_hash(&input)?;
         let scalar = U256::from_big_endian(&hash); // Big endian so the hash has leading zeroes
         let result = MAX_TARGET / scalar;
-        let difficulty = u64::from(result).into();
+        let difficulty = result.low_u64().into();
         Ok(difficulty)
     }
     #[cfg(not(feature = "monero_merge_mining"))]