Change default deviceId for MacOS

Summary: It appears the certificate provider is generating a deviceId which is then sent down to the flipper client to store (under CONNECTION_CONFIG_FILE). For MacOS, this ends up being "unknown". Yet when we attempt to connect to the flipper app, it expects empty string. This diff ensures that for MacOS, we're not sending down "unknown" for the client to store into its config file.

Reviewed By: danielbuechele

Differential Revision: D17190130

fbshipit-source-id: e0d9825f1f0330a03bcb3cf8d606d5bd9fcc1d7f

src/utils/CertificateProvider.tsx

@@ -136,6 +136,8 @@ export default class CertificateProvider {
       return this.getTargetAndroidDeviceId(appName, appDirectory, csr);
     } else if (os === 'iOS') {
       return this.getTargetiOSDeviceId(appName, appDirectory, csr);
+    } else if (os == 'MacOS') {
+      return Promise.resolve('');
     }
     return Promise.resolve('unknown');
   }