feat(example): Add "BIT0" to example instead of "1 << 0"

examples/protocols/https_mbedtls/main/https_mbedtls_example_main.c

@@ -61,7 +61,7 @@ static EventGroupHandle_t wifi_event_group;
 /* The event group allows multiple bits for each event,
    but we only care about one event - are we connected
    to the AP with an IP? */
-const int CONNECTED_BIT = 1 << 0;
+const int CONNECTED_BIT = BIT0;
 
 /* Constants that aren't configurable in menuconfig */
 #define WEB_SERVER "www.howsmyssl.com"