Basic workflow: change default for save best only to False

[vpratz]

By default, use the latest state instead of the best, as the losses can be unreliable for selecting the best model.

[codecov-commenter]

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Files with missing lines	Patch %	Lines
bayesflow/workflows/basic_workflow.py	0.00%	10 Missing ⚠️

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[paul-buerkner]

Looks good. You added some other code not related to the change in the title. Was this intentional?

[vpratz]

Thanks for taking a look. Yes, the changes were intentional and related to checkpoint saving as well (warning if existing checkpoints will be overridden), I forgot to mention them in the text.

[vpratz]

But looking at it again was good, I found a typo (checkpoint_filepath instead of checkpoint_full_filepath)...

[paul-buerkner]

Looks good from my side. @stefanradev93 do you want to take another look?