Updated slice entity outliner to use new consolidated StyledTreeView as well.

Signed-off-by: Chris Galvan <chgalvan@amazon.com>

Code/Editor/Plugins/ComponentEntityEditorPlugin/UI/Outliner/OutlinerTreeView.hxx

@@ -15,7 +15,8 @@
 
 #include <QBasicTimer>
 #include <QEvent>
-#include <QTreeView>
+
+#include <AzQtComponents/Components/Widgets/TreeView.h>
 #endif
 
 #pragma once
@@ -31,7 +32,7 @@ class OutlinerTreeViewModel;
 //! allow for dragging and dropping of entities from the outliner into the property editor
 //! of other entities. If the selection updates instantly, this would never be possible.
 class OutlinerTreeView
-    : public QTreeView
+    : public AzQtComponents::StyledTreeView
 {
     Q_OBJECT;
 public:
@@ -66,9 +67,7 @@ private:
 
     void processQueuedMousePressedEvent(QMouseEvent* event);
 
-    void startCustomDrag(const QModelIndexList& indexList, Qt::DropActions supportedActions);
-
-    QImage createDragImage(const QModelIndexList& indexList);
+    void StartCustomDrag(const QModelIndexList& indexList, Qt::DropActions supportedActions) override;
 
     void DrawLayerUI(QPainter* painter, const QRect& rect, const QModelIndex& index) const;