fix: Calendar color change

[AAfghahi]

SUMMARY

This changes the Calendar button on the chart page to be consistent with the one on the dashboard page.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Chart:

Dashboard:

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #16093 (1fce2b7) into master (a59d458) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #16093      +/-   ##
==========================================
- Coverage   76.86%   76.86%   -0.01%     
==========================================
  Files         995      995              
  Lines       52876    52877       +1     
  Branches     6720     6720              
==========================================
  Hits        40645    40645              
- Misses      12005    12006       +1     
  Partials      226      226              

Flag	Coverage Δ
javascript	71.26% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...tend/src/explore/components/ExploreChartHeader.jsx	55.55% <0.00%> (-0.79%)	⬇️

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[rosemarie-chiu]

🏷 2021.31