FIX: [STUDIO-1638] transparent background for Notebook

Change-Id: If849fe43349f87be66b53af48737a9a2c50aa237

src/slic3r/GUI/Notebook.hpp

@@ -391,19 +391,7 @@ protected:
     }
 
 private:
-    void Init()
-    {
-        // We don't need any border as we don't have anything to separate the
-        // page contents from.
-        SetInternalBorder(0);
-
-        // No effects by default.
-        m_showEffect =
-        m_hideEffect = wxSHOW_EFFECT_NONE;
-
-        m_showTimeout =
-        m_hideTimeout = 0;
-    }
+    void Init();
 
     wxShowEffect m_showEffect,
                  m_hideEffect;