squash: Fix ping timeout.

Author: bgrozev

jvb/src/main/kotlin/org/jitsi/videobridge/export/Exporter.kt

@@ -181,7 +181,6 @@ internal class Exporter(
             logger.debug { "Sent ping with id=$pingId" }
 
             // Schedule timeout check
-            pingTimeoutFuture?.cancel(false)
             pingTimeoutFuture = TaskPools.SCHEDULED_POOL.schedule({
                 handlePingTimeout()
             }, pingTimeoutMs.toLong(), TimeUnit.MILLISECONDS)