backends/drm: update cursor after compositing reset

Otherwise the cursor won't be shown, as its buffer and layer got destroyed

BUG: 453823

src/backends/drm/drm_gpu.cpp

@@ -811,6 +811,9 @@ void DrmGpu::recreateSurfaces()
             virtualOutput->recreateSurface();
         }
     }
+    for (const auto &output : qAsConst(m_drmOutputs)) {
+        output->updateCursor();
+    }
 }
 
 }

src/backends/drm/drm_output.h

@@ -50,6 +50,8 @@ public:
     void updateModes();
 
     bool usesSoftwareCursor() const override;
+    void updateCursor();
+    void moveCursor();
 
     void setColorTransformation(const QSharedPointer<ColorTransformation> &transformation) override;
 
@@ -60,8 +62,6 @@ private:
 
     QList<QSharedPointer<OutputMode>> getModes() const;
 
-    void updateCursor();
-    void moveCursor();
     void renderCursorOpengl(const QSize &cursorSize);
     void renderCursorQPainter();