esp8266/esp_mphal: No longer disable watchdog on startup.

Disabling it was an omission from early development stages.

esp8266/esp_mphal.c

@@ -46,7 +46,7 @@ void mp_hal_debug_tx_strn_cooked(void *env, const char *str, uint32_t len);
 const mp_print_t mp_debug_print = {NULL, mp_hal_debug_tx_strn_cooked};
 
 void mp_hal_init(void) {
-    ets_wdt_disable(); // it's a pain while developing
+    //ets_wdt_disable(); // it's a pain while developing
     mp_hal_rtc_init();
     uart_init(UART_BIT_RATE_115200, UART_BIT_RATE_115200);
 }