(bug)fix temperature control chart bounds

[ranjib]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1153 into master will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1153      +/-   ##
==========================================
- Coverage   72.36%   72.36%   -0.01%     
==========================================
  Files         270      270              
  Lines        8838     8830       -8     
  Branches      643      641       -2     
==========================================
- Hits         6396     6390       -6     
+ Misses       2043     2041       -2     
  Partials      399      399              

Flag	Coverage Δ
#go	66.73% <ø> (ø)
#javascript	78.27% <ø> (+<0.01%)	⬆️

Impacted Files	Coverage Δ
front-end/src/temperature/control_chart.jsx	96.15% <ø> (+5.52%)	⬆️
front-end/src/temperature/readings_chart.jsx	100.00% <ø> (ø)

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