Fixes #144 "blank" shape is ggplot shape 32

[pchelle]

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[codecov-commenter]

Codecov Report

Merging #145 (e9c3e86) into develop (0b77348) will increase coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #145      +/-   ##
===========================================
+ Coverage    49.51%   49.59%   +0.07%     
===========================================
  Files           53       53              
  Lines         2561     2561              
===========================================
+ Hits          1268     1270       +2     
+ Misses        1293     1291       -2     

Impacted Files	Coverage Δ
R/utilities-aesthetics.R	87.50% <ø> (ø)
R/plotconfiguration-background.R	70.49% <0.00%> (+3.27%)	⬆️

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[Yuri05]

looks good now! merging