replace TRUE/FALSE by stdbool true/false

sw/airborne/firmwares/tutorial/main_demo5.c

@@ -46,12 +46,12 @@ static inline void main_event_task(void)
     ReadPprzBuffer();
     if (pprz_msg_received) {
       pprz_parse_payload();
-      pprz_msg_received = FALSE;
+      pprz_msg_received = false;
     }
   }
   if (dl_msg_available) {
     main_dl_parse_msg();
-    dl_msg_available = FALSE;
+    dl_msg_available = false;
     LED_TOGGLE(1);
   }
 }