Fix ST demo config file
/* Default configuration for all demos. Individual demos can override these below */
#define democonfigDEMO_STACKSIZE ( configMINIMAL_STACK_SIZE * 8 )
#define democonfigDEMO_PRIORITY ( tskIDLE_PRIORITY + 5 )
+#define democonfigNETWORK_TYPES ( AWSIOT_NETWORK_TYPE_WIFI )
/* Some individual demos want to override these defaults, that is done in this section */
#if defined(democonfigTCP_ECHO_TASKS_SEPARATE_ENABLED)
