Debugger: Use Qt5-style connects in DebuggerKitConfigWidget

Change-Id: I1cac24387cc74ade9113b4ecbe503871e9c6150b
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/debugger/debuggeritemmanager.h

@@ -54,7 +54,7 @@ class DEBUGGER_EXPORT DebuggerItemManager : public QObject
     Q_OBJECT
 
 public:
-    static QObject *instance();
+    static DebuggerItemManager *instance();
     ~DebuggerItemManager();
 
     static QList<DebuggerItem> debuggers();