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f5c9be3a - Remove <cat-toy> validation prompt from examples/textual_inversion/textual_inversion_sdxl.py (#6877)

Remove <cat-toy> validation prompt from examples/textual_inversion/textual_inversion_sdxl.py (#6877) Remove <cat-toy> validation prompt from textual_inversion_sdxl.py The `<cat-toy>` validation prompt is a default choice for the example task in the README. But no other part of `textual_inversion_sdxl.py` references the cat toy and `textual_inversion.py` has a default validation prompt of `None` as well. So bring `textual_inversion_sdxl.py` in line with `textual_inversion.py` and change default validation prompt to `None`