Fix edit button of printer combo box not updates its color after them…

…e switch (#5412)

* Fix edit button of printer combo box not updates for dark theme

* Fix

* Merge branch 'main' into dark-mode-printer-combobox-edit-icon

src/slic3r/GUI/Plater.cpp

@@ -1498,6 +1498,7 @@ void Sidebar::sys_color_changed()
                                                                 p->combo_printer })
         combo->sys_color_changed();
 #endif
+    p->combo_printer->sys_color_changed();
     for (PlaterPresetComboBox* combo : p->combos_filament)
         combo->sys_color_changed();