Fix: Pool section disappearing after selecting rendering OS and switching back to normal

[timotheeguerin]

Fix #1576

Issue was with form section being added when picking rendering os(License picker section) and angular not registering the changes correctly when removing it

[codecov]

Codecov Report

Merging #1584 into master will decrease coverage by <.01%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           master    #1584      +/-   ##
==========================================
- Coverage   62.42%   62.42%   -0.01%     
==========================================
  Files        1112     1112              
  Lines       25603    25602       -1     
  Branches     4119     4117       -2     
==========================================
- Hits        15983    15981       -2     
- Misses       9620     9621       +1

Impacted Files	Coverage Δ
...ount/browse/account-list/account-list.component.ts	82.69% <100%> (-1.24%)	⬇️
...l/action/add/pool-create-basic-dialog.component.ts	19.09% <100%> (-0.73%)	⬇️
...ask/ui/form/form-section/form-section.component.ts	100% <100%> (ø)	⬆️
...tch-flask/ui/form/form-page/form-page.component.ts	88% <87.5%> (-2.48%)	⬇️

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