Drain radio callbacks before terminating the host executor

tools/chatgui-android/router-tests/src/test/kotlin/com/utun/chat/data/RadioPttLifecycleTest.kt

@@ -39,11 +39,11 @@ class RadioPttLifecycleTest {
     @After fun release() {
         Handler.rejectDelayed = false; context.permissionGranted = true
         engine.stop().get(5, TimeUnit.SECONDS)
+        main.advanceBy(10_000); drain() // Доставить прежние ACK-timeout callbacks до завершения их io-владельца.
         io.shutdown(); assertTrue(io.awaitTermination(5, TimeUnit.SECONDS))
         val barrier = Executors.newSingleThreadExecutor()
         try { barrier.submit { MediaAudioController.awaitIdle() }.get(5, TimeUnit.SECONDS) }
         finally { barrier.shutdownNow() }
-        main.advanceBy(10_000)
         assertTrue(context.receivers.isEmpty())
         assertTrue(AudioTrack.created.all { it.released })
         assertTrue(AndroidMicrophoneCapture.opened.all { it.closed })