Cleaners are doubled in the config when choosing more than one dataset

[roedoejet]

Bug description

I ran everyvoice new-project and selected two sources of data. I selected NFC normalization and lowercasing, and got the following:

cleaners: [everyvoice.utils.collapse_whitespace, everyvoice.utils.strip_text, everyvoice.utils.lower,
  everyvoice.utils.nfc_normalize, everyvoice.utils.lower, everyvoice.utils.nfc_normalize]

I should only have gotten:

cleaners: [everyvoice.utils.collapse_whitespace, everyvoice.utils.strip_text, everyvoice.utils.lower,
  everyvoice.utils.nfc_normalize]

How to reproduce the bug

No response

Error messages and logs

# Error messages and logs here please

Environment

Current environment

#- EveryVoice Version:
#- PyTorch Lightning Version (e.g., 2.4.0):
#- PyTorch Version (e.g., 2.4):
#- Python version (e.g., 3.12):
#- OS (e.g., Linux):
#- CUDA/cuDNN version:
#- GPU models and configuration:
#- How you installed EveryVoice (`conda`, `pip`, source):

More info

No response