fix(examples): Fix LVGL benchmark

Author: PetrESP

examples/display_lvgl_benchmark/main/main.c

@@ -31,10 +31,11 @@ void app_main(void)
     };
     cfg.lvgl_port_cfg.task_stack = 10000;
     bsp_display_start_with_config(&cfg);
-    bsp_display_start();
 #endif
+    bsp_display_start();
 
     /* Set display brightness to 100% */
+    bsp_display_brightness_init();
     bsp_display_backlight_on();
 
     ESP_LOGI(TAG, "Display LVGL demo");