Update ILineRadarChartDataSet.swift

[Ewg777]

Minor mistype fix

[codecov-io]

Codecov Report

Merging #3366 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3366   +/-   ##
=======================================
  Coverage   28.32%   28.32%           
=======================================
  Files         117      117           
  Lines       15676    15676           
  Branches      321      321           
=======================================
  Hits         4441     4441           
  Misses      11191    11191           
  Partials       44       44

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