QmlDebugger: Close connection already in shutdownInferior

Doing it in shutdownEngine was too late for the mixed debugger
case: The client has already exited in this case, leading to
error messages on the (system) console.

Change-Id: Id31214cb7a1bc9530c1da78b872531bc79894f3b
Reviewed-by: Aurindam Jana <aurindam.jana@nokia.com>

src/plugins/debugger/qml/qmlengine.cpp

@@ -628,14 +628,13 @@ void QmlEngine::shutdownInferior()
         resetLocation();
     }
     stopApplicationLauncher();
+    closeConnection();
 
     notifyInferiorShutdownOk();
 }
 
 void QmlEngine::shutdownEngine()
 {
-    closeConnection();
-
     // double check (ill engine?):
     stopApplicationLauncher();