Debugger: Initialize variables in debugger main window

Change-Id: I705e02d177b2d8cd41f87791441dcc9fa093e60a
Reviewed-by: hjk <hjk@qt.io>

src/plugins/debugger/debuggermainwindow.h

@@ -62,9 +62,9 @@ public:
         QByteArray dockId;
         QPointer<QWidget> widget;
         QByteArray anchorDockId;
-        OperationType operationType;
-        bool visibleByDefault;
-        Qt::DockWidgetArea area;
+        OperationType operationType = Raise;
+        bool visibleByDefault = true;
+        Qt::DockWidgetArea area = Qt::BottomDockWidgetArea;
     };
 
     Perspective() = default;