Add check for the fault implementation prior to setting it

packages/contracts-bedrock/scripts/Deploy.s.sol

@@ -693,6 +693,7 @@ contract Deploy is Deployer {
             DisputeGameFactory factory = DisputeGameFactory(mustGetAddress("DisputeGameFactoryProxy"));
             Claim absolutePrestate = Claim.wrap(bytes32(cfg.faultGameAbsolutePrestate()));
             IBigStepper faultVm = IBigStepper(new AlphabetVM(absolutePrestate));
+            if (address(factory.gameImpls(GameTypes.FAULT)) == address(0)) {
                 factory.setImplementation(GameTypes.FAULT, new FaultDisputeGame({
                     _absolutePrestate: absolutePrestate,
                     _maxGameDepth: cfg.faultGameMaxDepth(),
@@ -701,5 +702,6 @@ contract Deploy is Deployer {
                 console.log("DisputeGameFactory: set `FaultDisputeGame` implementation");
             }
         }
+    }
 }