feat(lwip): Modify lwip main task priority.
esp-idf's value is "configMAX_PRIORITIES-7", so with the fix they are same.
@@ -1223,7 +1223,7 @@ void *memp_malloc_ll(size_t type);
* The priority value itself is platform-dependent, but is passed to
* sys_thread_new() when the thread is created.
*/
-#define TCPIP_THREAD_PRIO (configMAX_PRIORITIES-5)
+#define TCPIP_THREAD_PRIO (configMAX_PRIORITIES-7)
/**
* TCPIP_MBOX_SIZE: The mailbox size for the tcpip thread messages
