Bugfix: Linear Composites, missing xcats when using xcat_agg

[Magnus167]

Closes #905

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03% 🎉

Comparison is base (9fe120e) 74.47% compared to head (29232ea) 74.51%.

❗ Current head 29232ea differs from pull request most recent head 854d118. Consider uploading reports for the commit 854d118 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #906      +/-   ##
===========================================
+ Coverage    74.47%   74.51%   +0.03%     
===========================================
  Files           31       31              
  Lines         3828     3833       +5     
===========================================
+ Hits          2851     2856       +5     
  Misses         977      977              

Files Changed	Coverage Δ
macrosynergy/panel/linear_composite.py	98.62% <100.00%> (+0.04%)	⬆️

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