test(desktop): clear presence before the doorbell stream opens in the E2E

Author: waleedlatif1

apps/sim/scripts/test-desktop-inbox-e2e.ts

@@ -408,9 +408,10 @@ async function run() {
     assert(registration.reconcileMs < PICKUP_GRACE_SECONDS * 1000)
   })
 
+  /** Starts absent, so only the stream open below can mark the device present. */
+  await redis.del(`desktop:presence:${desktop.deviceId}`)
   const doorbell = openDoorbell(desktop)
   await check('counts the device online once it opens its doorbell stream', async () => {
-    await redis.del(`desktop:presence:${desktop.deviceId}`)
     await doorbell.opened
     await waitFor(
       async () => (await redis.exists(`desktop:presence:${desktop.deviceId}`)) === 1,