Update qt_rendererstack.hpp: reorder some things to fix a warning.

src/qt/qt_rendererstack.hpp

@@ -116,6 +116,8 @@ public slots:
 private:
     void createRenderer(Renderer renderer);
 
+    QBoxLayout* boxLayout = nullptr;
+
     Ui::RendererStack *ui;
 
     int x;
@@ -139,8 +141,6 @@ private:
     std::atomic_bool rendererTakesScreenshots;
     std::atomic_bool switchInProgress{false};
 
-    QBoxLayout* boxLayout = nullptr;
-
     char auto_mouse_type[16];
 };