Remove widget pointer from StatisticsTabController

The pointer is not needed and is an anti pattern.

src/tabcontrollers/StatisticsTabController.cpp

@@ -7,11 +7,9 @@ namespace advsettings
 {
 void StatisticsTabController::initStage1() {}
 
-void StatisticsTabController::initStage2( OverlayController* var_parent,
-                                          QQuickWindow* var_widget )
+void StatisticsTabController::initStage2( OverlayController* var_parent )
 {
     this->parent = var_parent;
-    this->widget = var_widget;
 }
 
 void StatisticsTabController::eventLoopTick(

src/tabcontrollers/StatisticsTabController.h

@@ -26,7 +26,6 @@ class StatisticsTabController : public QObject
 
 private:
     OverlayController* parent;
-    QQuickWindow* widget;
 
     bool rotationResetFlag = false;
     float rotationOffset = 0.0f;
@@ -53,7 +52,7 @@ private:
 
 public:
     void initStage1();
-    void initStage2( OverlayController* parent, QQuickWindow* widget );
+    void initStage2( OverlayController* parent );
 
     void eventLoopTick( vr::TrackedDevicePose_t* devicePoses,
                         float leftSpeed,