FIX: dailytips display issue

jira: STUDIO-4980、STUDIO-4981

1. STUDIO-4980 fix that there is a incorrect image display in first page of dailytips
2. STUDIO-4981 fix some UI element display issue in dark mode: expand
   button color、image tint color
3. modify some tips content provided by salt.wei

Change-Id: Ie85da2f049b89f0358b19f587ce7aa7cce0164c7

src/slic3r/GUI/SlicingProgressNotification.hpp

@@ -48,6 +48,7 @@ public:
     // Switch between technology to provide correct text.
     void				set_fff(bool b) { m_is_fff = b; }
     void                set_export_possible(bool b) { m_export_possible = b; }
+    void                on_change_color_mode(bool is_dark) override;
 protected:
     void        init() override;
     void        render(GLCanvas3D& canvas, float initial_y, bool move_from_overlay, float overlay_width, float right_margin) override;