Fix SimulatorBridge on Xcode 9
Fix SimulatorBridge on Xcode 9

Summary: This has changed as there can now be multiple bridges.

Reviewed By: marekcirkos

Differential Revision: D5363837

fbshipit-source-id: 8a8d48855d4e7b9682ef438cb7d2c757ae78aff9

facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl