FIX: update the bitmap of icon for dark mode

jira: [STUDIO-12180]
Change-Id: Ib39f723be9b1f02f2f0dd21204d7831627481528
(cherry picked from commit 73d9f515de93d324c74878f3ceea5ee0f7049073)

src/slic3r/GUI/wxExtensions.hpp

@@ -263,6 +263,7 @@ public:
     void UseDefaultBitmapDisabled();
 
     void    msw_rescale();
+    void    UpdateDarkUI() { msw_rescale(); };
 
 private:
     wxWindow*       m_parent { nullptr };