Produce a log for settings changed

src/freedombone-installer

@@ -1633,7 +1633,8 @@ function update_app_settings {
                         app_value=$(awk -F ',' '{print $3}' < "$appsettings_file")
 
                         # shellcheck disable=SC2086
-                        ${app_name}_setting_${app_function} $app_value
+                        ${app_name}_setting_${app_function} $app_value > "$webadmin_install_dir/applog.txt"
+                        chown www-data:www-data "$webadmin_install_dir/applog.txt"
                     fi
                 fi
             fi