incorrect column being used for cellphonedb v5 output

[zktuong]

closes #93

[codecov]

Codecov Report

Attention: 155 lines in your changes are missing coverage. Please review.

Comparison is base (8b249e8) 70.47% compared to head (15db348) 73.22%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
+ Coverage   70.47%   73.22%   +2.74%     
==========================================
  Files           9        9              
  Lines        2161     2039     -122     
==========================================
- Hits         1523     1493      -30     
+ Misses        638      546      -92     

Files	Coverage Δ
R/utils.R	86.88% <ø> (+4.95%)	⬆️
R/plot_cpdb_heatmap.R	75.51% <80.00%> (ø)
R/plot_cpdb4.R	68.75% <70.73%> (+0.28%)	⬆️
R/plot_cpdb3.R	77.11% <65.30%> (+1.52%)	⬆️
R/plot_cpdb2.R	52.67% <55.17%> (+1.40%)	⬆️
R/plot_cpdb.R	67.45% <44.06%> (+2.68%)	⬆️