rtgui_demo: port to new API

bsp/simulator/rtgui_demo/snake/snake_gui.c

@@ -365,7 +365,7 @@ void snake_main(void)
     struct rtgui_win *win;
     rtgui_rect_t rect;
 
-    application = rtgui_app_create(rt_thread_self(), "sanke_app");
+    application = rtgui_app_create("sanke_app");
     if (application != RT_NULL)
     {
         rtgui_get_screen_rect(&rect);
@@ -397,4 +397,4 @@ void snake_main(void)
 }
 
 #include <finsh.h>
-FINSH_FUNCTION_EXPORT(snake_main, snake run)
\ No newline at end of file
+FINSH_FUNCTION_EXPORT(snake_main, snake run)