4D PCA-ARSDI: reference cube now properly passed when source_xy is given

[IainHammond]

As title: this one was overlooked by me. I also added a small memory improvement (res_ifs_adi didn't need a wavelength axis)

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 50.32%. Comparing base (6f333b0) to head (67137a0).
⚠️ Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
src/vip_hci/psfsub/pca_fullfr.py	50.00%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #713      +/-   ##
==========================================
+ Coverage   50.28%   50.32%   +0.04%     
==========================================
  Files          88       88              
  Lines       17058    17058              
==========================================
+ Hits         8577     8585       +8     
+ Misses       8481     8473       -8     

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[IainHammond]

Test 3.13.2 is fine, sometimes the data download fails but it was probably because I was running the test on my fork too