BF: Slider did not respect color kwarg

[hoechenberger]

No description provided.

[coveralls]

Coverage increased (+0.3%) to 48.447% when pulling 60973ef on hoechenberger:slider into 029a800 on psychopy:master.

[codecov-io]

Codecov Report

Merging #1944 into master will increase coverage by 0.24%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1944      +/-   ##
==========================================
+ Coverage   43.88%   44.13%   +0.24%     
==========================================
  Files         207      207              
  Lines       36360    36362       +2     
  Branches     6214     6214              
==========================================
+ Hits        15958    16049      +91     
+ Misses      18853    18749     -104     
- Partials     1549     1564      +15

Impacted Files	Coverage Δ
psychopy/visual/slider.py	47.7% <100%> (+31.55%)	⬆️
psychopy/visual/textbox/fontmanager.py	70.03% <0%> (-1.05%)	⬇️
psychopy/visual/basevisual.py	67.12% <0%> (+0.17%)	⬆️
psychopy/visual/elementarray.py	77.92% <0%> (+0.66%)	⬆️
psychopy/data/base.py	72.76% <0%> (+0.89%)	⬆️
psychopy/visual/shape.py	82.81% <0%> (+2.64%)	⬆️

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