`batch_size` does not work when it is not 1

[yuxi-liu-wired]

There are 5 occurrences of batch_size = 1 in Stable Diffusion Deep Dive.ipynb. The notebook would fail if any of them is set to other values.

The fix is to change

text_input = tokenizer([prompt], ...)
# or
text_input = tokenizer(prompt, ...)

to

text_input = tokenizer([prompt] * batch_size, ...)