iOSDeviceManager queryDevicesForever converted to async

Summary: ^

Reviewed By: lawrencelomax

Differential Revision: D47912037

fbshipit-source-id: ac7a9650c82219a21577e6bca7e08d075ae5da15

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

@@ -184,16 +184,15 @@ export class IOSDeviceManager {
     }
   }
 
-  private queryDevicesForever(bridge: IOSBridge) {
-    return this.queryDevices(bridge)
-      .then(() => {
+  private async queryDevicesForever(bridge: IOSBridge) {
+    try {
+      await this.queryDevices(bridge);
       // It's important to schedule the next check AFTER the current one has completed
       // to avoid simultaneous queries which can cause multiple user input prompts.
       setTimeout(() => this.queryDevicesForever(bridge), 3000);
-      })
-      .catch((err) => {
+    } catch (err) {
       console.warn('Failed to continuously query devices:', err);
-      });
+    }
   }
 
   async checkXcodeVersionMismatch() {