fix(plugin-chart-echarts): fix legend margin in radar and timeseries echart

[stephenLYZ]

🐛 Bug Fix
fix issue apache/superset#16345

2021-11-13.12.26.38.mov

[vercel]

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[codecov]

Codecov Report

Merging #1470 (117d24e) into master (5928355) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1470   +/-   ##
=======================================
  Coverage   30.91%   30.91%           
=======================================
  Files         502      502           
  Lines       10220    10220           
  Branches     1762     1762           
=======================================
  Hits         3160     3160           
  Misses       6808     6808           
  Partials      252      252           

Impacted Files	Coverage Δ
...s/plugin-chart-echarts/src/Radar/transformProps.ts	0.00% <ø> (ø)
...gin-chart-echarts/src/Timeseries/transformProps.ts	53.75% <ø> (ø)

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