PacketQueueBase: Fixed counting push operations on the queue.

The text displayed above the queue submodule showed 0 push operations and
non-zero pull operations. When the packetPushed signal was split into
packetPushStarted/packetPushEnded in PacketQueue, the statistic calculation
was not updated.

src/inet/queueing/base/PacketQueueBase.cc

@@ -52,7 +52,7 @@ Packet *PacketQueueBase::dequeuePacket()
 
 void PacketQueueBase::emit(simsignal_t signal, cObject *object, cObject *details)
 {
-    if (signal == packetPushedSignal)
+    if (signal == packetPushedSignal || signal == packetPushStartedSignal)
         numPushedPackets++;
     else if (signal == packetPulledSignal)
         numPulledPackets++;