Removed old skin references

Author: snipe

app/Http/Controllers/SettingsController.php

@@ -405,7 +405,6 @@ public function postBranding(ImageUploadRequest $request) : RedirectResponse
         $setting->support_footer = $request->input('support_footer');
         $setting->version_footer = $request->input('version_footer');
         $setting->footer_text = $request->input('footer_text');
-        $setting->allow_user_skin = $request->input('allow_user_skin', '0');
         $setting->show_url_in_emails = $request->input('show_url_in_emails', '0');
         $setting->logo_print_assets = $request->input('logo_print_assets', '0');
         $setting->load_remote = $request->input('load_remote', 0);