Fix float precision issue in sideTitles, #1473

[imaNNeo]

• LineChartSample11 is broken

[codecov]

Codecov Report

Merging #1479 (f7d521f) into master (c8dc3c0) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1479      +/-   ##
==========================================
+ Coverage   86.62%   86.69%   +0.06%     
==========================================
  Files          45       46       +1     
  Lines        3014     3028      +14     
==========================================
+ Hits         2611     2625      +14     
  Misses        403      403              

Files	Coverage Δ
...b/src/chart/base/axis_chart/axis_chart_helper.dart	100.00% <100.00%> (ø)
lib/src/extensions/double_extension.dart	100.00% <100.00%> (ø)
lib/src/utils/utils.dart	100.00% <100.00%> (ø)

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