[flux dreambooth lora training] make LoRA target modules configurable + small bug fix (#9646)
* make lora target modules configurable and change the default
* style
* make lora target modules configurable and change the default
* fix bug when using prodigy and training te
* fix mixed precision training as proposed in https://github.com/huggingface/diffusers/pull/9565 for full dreambooth as well
* add test and notes
* style
* address sayaks comments
* style
* fix test
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Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>