Removed unused variable

Author: makarenya

system/Middlewares/ST/STM32_USB_Device_Library/Core/Inc/usbd_def.h

@@ -241,7 +241,6 @@ typedef struct _USBD_HandleTypeDef {
   uint8_t                 dev_state;
   uint8_t                 dev_old_state;
   uint8_t                 dev_address;
-  uint8_t                 dev_connection_status;
   uint8_t                 dev_test_mode;
   uint32_t                dev_remote_wakeup;