Channel drop should happen before setting montage

[dnacombo]

Hi,
My data contains a Cz channel that is not part of the montage I'm using.
In the config file, there is this statement:

# !!! warning
#     If the data contains channel names that are not part of the template montage, the
#     pipeline run will fail with an error message. You must either pick a different
#     montage or remove those channels via
#     [`drop_channels`][mne_bids_pipeline._config.drop_channels] to continue.

However, the config drop_channels is set to 'Cz'.
Investigating the issue in the code, I find out in _import_data.py
lines 440 and following:

   # 1. _load_data (_crop_data)
    raw = _load_data(cfg=cfg, bids_path=bids_path_in)
    # 2. _set_eeg_montage
    _set_eeg_montage(cfg=cfg, raw=raw, subject=subject, session=session, run=run)
    # 3. _create_bipolar_channels
    _create_bipolar_channels(
        cfg=cfg, raw=raw, subject=subject, session=session, run=run
    )
    # 4. _drop_channels_func
    _drop_channels_func(cfg=cfg, raw=raw, subject=subject, session=session)

I suggest moving set_eeg_montage down after drop_channels, as in #1220