fix(esp_modem): Exit data mode only after state change

Previously, we set the notification also for  event
causing permature PPP mode exit

Author: david-cermak

components/esp_modem/src/esp_modem_netif.cpp

@@ -21,7 +21,7 @@ void Netif::on_ppp_changed(void *arg, esp_event_base_t event_base,
                            int32_t event_id, void *event_data)
 {
     auto *ppp = static_cast<Netif *>(arg);
-    if (event_id < NETIF_PP_PHASE_OFFSET) {
+    if (event_id > NETIF_PPP_ERRORNONE && event_id < NETIF_PP_PHASE_OFFSET) {
         ESP_LOGI("esp_modem_netif", "PPP state changed event %" PRId32, event_id);
         // only notify the modem on state/error events, ignoring phase transitions
         ppp->signal.set(PPP_EXIT);