Removed unnecessary #include statement

examples/protocols/http_server/ws_echo_server/main/ws_echo_server.c

@@ -13,7 +13,6 @@
 #include <esp_system.h>
 #include <nvs_flash.h>
 #include <sys/param.h>
-#include "nvs_flash.h"
 #include "esp_netif.h"
 #include "esp_eth.h"
 #include "protocol_examples_common.h"