Improve error message

[tcompa]

When hitting this error:

cellvoyager_to_ome_zarr_init_multiplex
    raise ValueError(f"{info}ERROR: No plates detected")

ValueError: Listing all plates/channels:
Include patterns: ['*.tif', '*_B05_*']
Exclude patterns: ['*_A0[123456]_*']
Plates:   []
Actual wavelength IDs: []
ERROR: No plates detected

it would be very useful to know which folder was scanned for images.