undefined key set_davg_zero is not allowed in strict mode

[ZSHtju]

I am using the recently released deepmd 2.2.0 installed from conda.
When I using finetune OC_10M.pb, dp cannot train the dataset with the error " undefined key set_davg_zero is not allowed in strict mode". I try to delete this key, but it will be automatically added into the input file.

[njzjz]

Fixed in #2397.