fix: Filter bar not occupying 100% height when filter sets FF unset

[michael-s-molina]

SUMMARY

Fixes #15218

@villebro @kgabryje @rusackas

AFTER VIDEO

screen-recording-2021-06-17-at-95802-am_nIjHIhp7.mov

TESTING INSTRUCTIONS

See the original issue for 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 #15228 (33405bb) into master (7237324) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #15228   +/-   ##
=======================================
  Coverage   77.16%   77.17%           
=======================================
  Files         971      971           
  Lines       50243    50248    +5     
  Branches     6112     6113    +1     
=======================================
+ Hits        38772    38777    +5     
  Misses      11268    11268           
  Partials      203      203           

Flag	Coverage Δ
javascript	71.77% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...d/components/DashboardBuilder/DashboardBuilder.tsx	89.89% <100.00%> (+0.53%)	⬆️
...board/components/nativeFilters/FilterBar/index.tsx	90.81% <100.00%> (ø)

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[villebro]

LGTM - tested with NF and NF+FS, works well with both

[villebro]

any reason for the 2 px difference?