feat: add stealth mode select step to setup wizard (#6104)

feat: add stealth mode select to setup wizard

feat: enable stealth mode until user finishes setup wizard

Co-authored-by: SoftFever <softfeverever@gmail.com>

src/slic3r/GUI/WebGuideDialog.hpp

@@ -109,6 +109,7 @@ private:
 
     // User Config
     bool PrivacyUse;
+    bool StealthMode;
     std::string m_Region;
 
     bool InstallNetplugin;