Update train_dreambooth_lora_sdxl_advanced.py (#7227)

adding the type gives you

```
TypeError: _StoreTrueAction.__init__() got an unexpected keyword argument 'type'
```

examples/advanced_diffusion_training/train_dreambooth_lora_sdxl_advanced.py

@@ -666,7 +666,6 @@ def parse_args(input_args=None):
     )
     parser.add_argument(
         "--use_dora",
-        type=bool,
         action="store_true",
         default=False,
         help=(