fixes composition plotting error #770

[iantaylor-NOAA]

As discussed in #770 there was a bug in the read of the comp data specification table for the format used in 3.30.21. This should fix it.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (3ea9697) 51.96% compared to head (373c64c) 51.96%.

❗ Current head 373c64c differs from pull request most recent head 960e3aa. Consider uploading reports for the commit 960e3aa to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #801      +/-   ##
==========================================
- Coverage   51.96%   51.96%   -0.01%     
==========================================
  Files         111      111              
  Lines       26202    26204       +2     
==========================================
  Hits        13616    13616              
- Misses      12586    12588       +2     

Impacted Files	Coverage Δ
R/SSplotComps.R	40.76% <0.00%> (-0.06%)	⬇️

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