Increase device detection timeout

Summary:
Attempt to fix https://fb.workplace.com/groups/1489943347777350/permalink/3388159547955711/

Overview of failures: https://www.internalfb.com/intern/daiquery/workspace/612628209459766/385682425880686/

Seems to have regressed since introducing D24858332 (9b4e7e873c), although only a few users are significantly impact, and beyond that it seems mostly one-off errors, which might indicate that the timing is a bit too tight.

Reviewed By: nikoant

Differential Revision: D25121853

fbshipit-source-id: a1b08a1b433c3db1aca3c1e6c6cc29a4c5b50f26

desktop/app/src/server.tsx

@@ -665,7 +665,7 @@ async function findDeviceForConnection(
         const error = `Timed out waiting for device ${serial} for client ${clientId}`;
         console.error(error);
         reject(error);
-      }, 5000);
+      }, 15000);
       unsubscribe = sideEffect(
         store,
         {name: 'waitForDevice', throttleMs: 100},