fix: time range in filter box error

[zhaoyongjie]

SUMMARY

this PR is an urgent fix for regression introduced by #14841. Before #14841, when multiple select checkbox is unchecked in filterbox, selected filter value can not pass through query and trigger chart render on dashboard. Unfortunately, this PR introduced a regression that when there's time range filter in the filterbox, time filter value as STRING gets converted into array. This change doesn't affect any other control in the filterbox.

This PR is a fix forward of #14841, and will resolve both the original issue #14804 and the regression mentioned above.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before

before-filter.mp4

After

May-28-2021.10-25-37.mp4

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 #14890 (4e9302b) into master (2313e3e) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #14890      +/-   ##
==========================================
- Coverage   77.61%   77.60%   -0.01%     
==========================================
  Files         963      963              
  Lines       49264    49266       +2     
  Branches     6205     6207       +2     
==========================================
  Hits        38235    38235              
- Misses      10828    10830       +2     
  Partials      201      201              

Flag	Coverage Δ
javascript	72.43% <0.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
...rontend/src/visualizations/FilterBox/FilterBox.jsx	56.60% <0.00%> (-0.73%)	⬇️

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[junlincc]

@nytai many thanks for your quick review 🙏!!