Query devices should be async

Summary: ^

Reviewed By: aigoncharov

Differential Revision: D48781102

fbshipit-source-id: c987be90c7bca7dbab40a89b389ee86ef2230393

desktop/flipper-server-core/src/devices/ios/iOSDeviceManager.tsx

@@ -97,10 +97,9 @@ export class IOSDeviceManager {
     ];
   }
 
-  queryDevices(bridge: IOSBridge): Promise<any> {
-    return bridge
-      .getActiveDevices(true)
-      .then((devices) => this.processDevices(bridge, devices));
+  async queryDevices(bridge: IOSBridge): Promise<any> {
+    const devices = await bridge.getActiveDevices(true);
+    return this.processDevices(bridge, devices);
   }
 
   private processDevices(bridge: IOSBridge, activeDevices: IOSDeviceParams[]) {