change l1mntSuccess default value to true (#105)

packages/contracts-bedrock/contracts/L1/OptimismPortal.sol

@@ -413,7 +413,7 @@ contract OptimismPortal is Initializable, ResourceMetering, Semver {
         //   2. The amount of gas provided to the execution context of the target is at least the
         //      gas limit specified by the user. If there is not enough gas in the current context
         //      to accomplish this, `callWithMinGas` will revert.
-        bool l1mntSuccess = false;
+        bool l1mntSuccess = true;
         if (_tx.mntValue>0){
             l1mntSuccess = IERC20(L1_MNT_ADDRESS).transfer(_tx.target, _tx.mntValue);
         }