allow for minimal scope of wifi_init_config_t

With this change one can use the default config as a variable with minimal scope: esp_wifi_init(&(wifi_init_config_t)WIFI_INIT_CONFIG_DEFAULT())

components/esp_wifi/include/esp_wifi.h

@@ -218,7 +218,7 @@ extern uint64_t g_wifi_feature_caps;
     .mgmt_sbuf_num = WIFI_MGMT_SBUF_NUM, \
     .feature_caps = g_wifi_feature_caps, \
     .magic = WIFI_INIT_CONFIG_MAGIC\
-};
+}
 
 /**
   * @brief  Initialize WiFi