fix(plugin-chart-echarts): fix incorrect groupby in buildQuery

[villebro]

🐛 Bug Fix
Fix a regression caused by party contradictory naming in controls/buildQuery.

[vercel]

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[codecov]

Codecov Report

Merging #800 into master will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #800      +/-   ##
==========================================
- Coverage   25.35%   25.34%   -0.01%     
==========================================
  Files         354      354              
  Lines        7881     7882       +1     
  Branches     1035     1036       +1     
==========================================
  Hits         1998     1998              
  Misses       5774     5774              
- Partials      109      110       +1     

Impacted Files	Coverage Δ
.../plugin-chart-echarts/src/Timeseries/buildQuery.ts	42.85% <0.00%> (-7.15%)	⬇️
...lugin-chart-echarts/src/Timeseries/controlPanel.ts	100.00% <ø> (ø)
...ugins/legacy-plugin-chart-sankey-loop/src/index.js	0.00% <0.00%> (ø)

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[rusackas]

LGTM!