dreambooth: fix #1566: maintain fp32 wrapper when saving a checkpoint to avoid crash when running fp16#1567

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timh wants to merge 2 commits intohuggingface:mainfrom

Commits on Dec 8, 2022

dreambooth: fix #1566: maintain fp32 wrapper when saving a checkpoint to avoid crash when running fp16
timh
committed
dreambooth: guard against passing keep_fp32_wrapper arg to older versions of accelerate. part of fix for #1566
timh
committed