Fix ICLabel topographic features on ICA fitted with channel selection

[mscheltienne]

Closes #67.

Someone was going to run into it at some point.. turns out it was me from the future:

mne-icalabel/mne_icalabel/iclabel/features.py

Line 173 in a411e45

# TODO: Selection of channels is missing.

[codecov]

Codecov Report

Merging #68 (c4d08d2) into main (ecc6a91) will increase coverage by 0.53%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
+ Coverage   96.22%   96.75%   +0.53%     
==========================================
  Files          15       15              
  Lines         556      555       -1     
==========================================
+ Hits          535      537       +2     
+ Misses         21       18       -3     

Impacted Files	Coverage Δ
mne_icalabel/datasets/icalabel/icalabel.py	100.00% <ø> (ø)
mne_icalabel/iclabel/features.py	100.00% <100.00%> (+1.44%)	⬆️
mne_icalabel/iclabel/utils.py	92.39% <100.00%> (ø)

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[mscheltienne]

Still some dataset download issue..
Tests are green locally, I'll merge.