dnp3: check done state, not complete state for progress

Complete is a flag used to tell if the message was completely parsed,
as not all messages may be completely parsed if we don't know all
their objects. However, they are still "done".

In the alstate-progress callback, check the done flag, not the
complete flag.

Ticket: #8181
(cherry picked from commit d61eef9a8a)

src/app-layer-dnp3.c

@@ -1438,7 +1438,7 @@ static int DNP3GetAlstateProgress(void *tx, uint8_t direction)
         SCReturnInt(1);
     }
 
-    if (dnp3tx->complete)
+    if (dnp3tx->done)
         retval = 1;
 
     SCReturnInt(retval);