FIX: the event should be skipped, so that the CheckBox could be toggled

JIRA: [STUDIO-14861]
Change-Id: I72e9e77c0e81e9cf64de7258ca09c225d5c3f807
(cherry picked from commit 9861c3d6bcd7e2720d1fccaacb820e13b5d7adb7)

src/slic3r/GUI/FilamentMapDialog.cpp

@@ -274,6 +274,8 @@ void FilamentMapDialog::on_checkbox(wxCommandEvent &event)
         dialog.ShowModal();
         this->Close();
     }
+
+    event.Skip();
 }
 
 void FilamentMapDialog::on_ok(wxCommandEvent &event)