Valgrind: Use Runnable to pass device information

... in case of "External Application" starts.

Change-Id: I6a5c215831f16c51e3cf98c35dbb792f53128d42
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/valgrind/memchecktool.cpp

@@ -454,7 +454,6 @@ MemcheckTool::MemcheckTool(QObject *parent)
         rc->createWorker(MEMCHECK_RUN_MODE);
         const auto runnable = dlg.runnable();
         rc->setRunnable(runnable);
-        rc->setConnection(UrlConnection(dlg.serverUrl()));
         rc->setDisplayName(runnable.executable);
         ProjectExplorerPlugin::startRunControl(rc);
     });