Mode button fixes / improvements (#13795)

* init

* update thumb color

src/slic3r/GUI/Widgets/SwitchButton.hpp

@@ -78,7 +78,13 @@ private:
 private:
     int      m_selection { 0 };
     bool     m_pressed   { false };
+    bool     m_enabled   { true };
     wxString m_tooltips[3];
+    StateColor dot_active;
+    StateColor dot_dimmed;
+    StateColor text_color;
+    StateColor track_background;
+    StateColor track_border;
 };
 
 class MultiSwitchButton : public StaticBox