remove unneded class CNodeCombinedStats; from rpcconsole.cpp

- also 2 small style fixes

src/qt/rpcconsole.cpp

@@ -231,6 +231,7 @@ RPCConsole::RPCConsole(QWidget *parent) :
 
     startExecutor();
     setTrafficGraphRange(INITIAL_TRAFFIC_GRAPH_MINS);
+
     ui->detailWidget->hide();
 
     clear();

src/qt/rpcconsole.h

@@ -13,7 +13,6 @@
 #include <QDialog>
 
 class ClientModel;
-class CNodeCombinedStats;
 
 QT_BEGIN_NAMESPACE
 class QItemSelection;