chore: align TCP receive windows with default opt

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>
Co-Authored-by: raphael valentin <raphaelvalentin@users.noreply.github.com

Author: fpistm

src/lwipopts_default.h

@@ -126,7 +126,7 @@ a lot of data that needs to be copied, this should be set high. */
 #define TCP_SND_QUEUELEN        (2* TCP_SND_BUF/TCP_MSS)
 
 /* TCP receive window. */
-#define TCP_WND                 (3*TCP_MSS)
+#define TCP_WND                 (4*TCP_MSS)
 
 #define LWIP_TCP_KEEPALIVE                  1   /* Keep the TCP link active. Important for MQTT/TLS */
 #define LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS  1   /* Prevent the same port to be used after reset.