Update test_vis.py

[thyneb19]

Overview

Issue when running test_vis in Github Actions. Adjusted test_scatter_chart and test_colored_scatter_chart

Changes

The matplotlib cases were failing on the Github Actions test suite. Adjusted assert statements to also check for axis font size.

[codecov]

Codecov Report

Merging #315 (48f8b00) into master (0748949) will decrease coverage by 0.17%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master     #315      +/-   ##
==========================================
- Coverage   81.06%   80.88%   -0.18%     
==========================================
  Files          50       50              
  Lines        3596     3615      +19     
==========================================
+ Hits         2915     2924       +9     
- Misses        681      691      +10     

Impacted Files	Coverage Δ
lux/vislib/matplotlib/ScatterChart.py	75.29% <75.00%> (-5.01%)	⬇️
lux/vislib/altair/Heatmap.py	93.10% <0.00%> (-3.45%)	⬇️
lux/vislib/matplotlib/Heatmap.py	96.66% <0.00%> (-1.67%)	⬇️

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