feat(esp_http_server): Modified the calculation of buf_len

Modified the calculation of buf_len, so that scratch buffer allocates
the memory according to requirement and not extra (except the last read chunk)

examples/protocols/https_server/simple/main/main.c

@@ -44,6 +44,7 @@ static esp_err_t root_get_handler(httpd_req_t *req)
 {
     httpd_resp_set_type(req, "text/html");
     httpd_resp_send(req, "<h1>Hello Secure World!</h1>", HTTPD_RESP_USE_STRLEN);
+
     return ESP_OK;
 }
 

examples/protocols/https_server/simple/sdkconfig.defaults

@@ -1,2 +1 @@
 CONFIG_ESP_HTTPS_SERVER_ENABLE=y
-CONFIG_HTTPD_MAX_REQ_HDR_LEN=1024