Fix Cube Fit component initialization #3727
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Fixes initializing a model component when a spectral subset is selected and Cube Fit is toggled on (specifically with a cube with spectral axis index of 0). I also took the opportunity to avoid sending data through the glue-astronomy translators just to get a subset mask and instead use the Glue
to_mask
method on the data object itself.I'll try to add some coverage before merging, opening as draft to see if the tests pass here before I mark ready for review.