modify for Character Alert: characters is deprecated

[suzuhiroruri]

character is deprecated.
As for "count character" code, delete "character" code.
You will delete deprecated alert.

[liuxuan30]

#2933 #2866

[codecov-io]

Codecov Report

Merging #2942 into master will not change coverage.
The diff coverage is 28.57%.

@@           Coverage Diff           @@
##           master    #2942   +/-   ##
=======================================
  Coverage   19.64%   19.64%           
=======================================
  Files         113      113           
  Lines       13792    13792           
=======================================
  Hits         2709     2709           
  Misses      11083    11083

Impacted Files	Coverage Δ
...ts/Renderers/XAxisRendererHorizontalBarChart.swift	0% <0%> (ø)	⬆️
Source/Charts/Renderers/YAxisRenderer.swift	55.94% <0%> (ø)	⬆️
Source/Charts/Renderers/XAxisRenderer.swift	59.07% <0%> (ø)	⬆️
...ts/Renderers/YAxisRendererHorizontalBarChart.swift	0% <0%> (ø)	⬆️
Source/Charts/Components/AxisBase.swift	48.73% <100%> (ø)	⬆️
Source/Charts/Charts/ChartViewBase.swift	24.23% <50%> (ø)	⬆️

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