remove wifi_tweak

pio_local.ini_example

@@ -2,7 +2,6 @@
 
 [common]
 ; custom build flags to use in my_build_flags
-;  -DEMSESP_WIFI_TWEAK ; experimental WiFi tweaks for stability
 ;  -DEMSESP_UART_DEBUG ; debugging UART
 ;  -DEMSESP_DEBUG ; enables DEBUG to the log. Will generate a lot of extra traffic on Console and Syslog
 ;  -DEMSESP_DEFAULT_BOARD_PROFILE=\"NODEMCU\" ; hard code the default board name

src/system.h

@@ -75,7 +75,6 @@ class System {
     bool upload_status();
     void show_mem(const char * note);
     void reload_settings();
-    void wifi_tweak();
     void syslog_init();
     bool check_upgrade(bool factory_settings);
     bool check_restore();