tests: Remove another usage of deprecated asQWidget()

src/qtwidgets/views/ViewWrapper_qtwidgets.cpp

@@ -304,3 +304,8 @@ DropArea *ViewWrapper_qtwidgets::asDropArea() const
 {
     return qobject_cast<DropArea *>(m_widget);
 }
+
+QWidget *ViewWrapper_qtwidgets::widget() const
+{
+    return m_widget;
+}

src/qtwidgets/views/ViewWrapper_qtwidgets.h

@@ -58,6 +58,8 @@ public:
 
     DropArea *asDropArea() const override;
 
+    QWidget *widget() const;
+
 private:
     QPointer<QWidget> m_widget;
 };

tests/qtwidgets/tst_qtwidgets.cpp

@@ -27,6 +27,7 @@
 #include "controllers/DockWidget.h"
 #include "controllers/MainWindow.h"
 #include "qtwidgets/views/MainWindow_qtwidgets.h"
+#include "qtwidgets/views/ViewWrapper_qtwidgets.h"
 
 #include <QObject>
 #include <QPushButton>
@@ -929,7 +930,8 @@ void TestQtWidgets::tst_negativeAnchorPositionWhenEmbedded()
 
     layout->checkSanity();
 
-    delete m->window()->asQWidget();
+    auto wrapper = static_cast<Views::ViewWrapper_qtwidgets *>(m->window().get());
+    delete wrapper->widget();
 }
 
 void TestQtWidgets::tst_restoreResizesLayout()