turn off preload and async scanning

Until more qa can be done here , I have reports of these causing issues and first scans being empty on latest IDF and chips

WiFiManager.h

@@ -621,9 +621,12 @@ class WiFiManager
     // 
     // preload scanning causes AP to delay showing for users, but also caches and lets the cp load faster once its open
     //  my scan takes 7-10 seconds
-    boolean       _preloadwifiscan        = true; // preload wifiscan if true
+    public:
+    boolean       _preloadwifiscan        = false; // preload wifiscan if true
     unsigned int  _scancachetime          = 30000; // ms cache time for preload scans
-    boolean       _asyncScan              = true; // perform wifi network scan async
+    boolean       _asyncScan              = false; // perform wifi network scan async
+
+    private:
 
     boolean       _autoforcerescan        = false;  // automatically force rescan if scan networks is 0, ignoring cache