Debugger: Modernize

modernize-use-auto
modernize-use-nullptr
modernize-use-override
modernize-use-using
modernize-use-default-member-init
modernize-use-equals-default

Change-Id: I91a6874f0d7b94e9079ab4ef07c23c60c80be9c0
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/debugger/loadcoredialog.h

@@ -41,9 +41,9 @@ class AttachCoreDialog : public QDialog
 
 public:
     explicit AttachCoreDialog(QWidget *parent);
-    ~AttachCoreDialog();
+    ~AttachCoreDialog() override;
 
-    int exec();
+    int exec() override;
 
     QString localExecutableFile() const;
     QString localCoreFile() const;