Fix & Optimize contract

contracts/ytLp/tokens/WUSD.sol

@@ -12,6 +12,11 @@ import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
  */
 contract WUSD is Initializable, ERC20Upgradeable, UUPSUpgradeable, OwnableUpgradeable {
     
+    /// @custom:oz-upgrades-unsafe-allow constructor
+    constructor() {
+        _disableInitializers();
+    }
+    
     /**
      * @notice 初始化合约
      * @param _name 代币名称