fixes for a few small taxatree plot bugs

[codecov-commenter]

Codecov Report

Merging #81 (b75f63c) into main (74eddb9) will increase coverage by 2.57%. The diff coverage is 78.57%.

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
+ Coverage   72.46%   75.04%   +2.57%     
==========================================
  Files          68       68              
  Lines        4580     4604      +24     
==========================================
+ Hits         3319     3455     +136     
+ Misses       1261     1149     -112     

Impacted Files	Coverage Δ
R/tax_transform.R	83.33% <25.00%> (+0.21%)	:arrow_up:
R/taxatree_plotkey.R	93.16% <87.50%> (+93.16%)	:arrow_up:
R/taxatree_funs.R	92.75% <100.00%> (+5.25%)	:arrow_up:
R/taxatree_plots.R	94.84% <100.00%> (+0.39%)	:arrow_up:
R/taxatree_models.R	75.75% <0.00%> (+6.06%)	:arrow_up:
R/taxatree_label.R	100.00% <0.00%> (+100.00%)	:arrow_up:

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