`everyvoice demo` creates folders in an active directory

Running `everyvoice demo` creates logs_and_checkpoints and preprocessed/YourDataSet folders if they don't exist in a directory which had been active when the `everyvoice demo` command was activated.
Running speech synthesis in demo interface creates a synthesis_output folder with a wav folder and latest_predict_data.pth file in it.
Although demo doesn't save anything in the created folders, no folder creation should occur.

Reproduce the issue by running `everyvoice demo` and the speech synthesis flow in the demo interface from a clean active directory. Trace where `logs_and_checkpoints`, `preprocessed/YourDataSet`, and `synthesis_output` are created; done means the demo completes without creating any of these folders or files.

Written by the indexing model from the issue text.