Remove reference to inexisting 'deploy' variable in SafeToL2Setup deployment (#822)

merging #742 broke the build because it used a different deployer
account. This PR fixes it by using the new one in the SafeToL2Setup
contract deployment

Author: mmv08

src/deploy/deploy_libraries.ts

@@ -36,7 +36,7 @@ const deploy: DeployFunction = async function (hre: HardhatRuntimeEnvironment) {
     });
 
     await deploy("SafeToL2Setup", {
-        from: deployer,
+        from: deployerAccount,
         args: [],
         log: true,
         deterministicDeployment: true,