Fix scale pool save button disabled

[timotheeguerin]

fix #1441

[codecov]

Codecov Report

Merging #1447 into stable will decrease coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           stable    #1447      +/-   ##
==========================================
- Coverage   53.64%   53.62%   -0.03%     
==========================================
  Files        1023     1023              
  Lines       24307    24317      +10     
  Branches     2800     2797       -3     
==========================================
  Hits        13040    13040              
- Misses      11267    11277      +10

Impacted Files	Coverage Δ
...s/pool/action/scale/pool-scale-picker.component.ts	10.52% <0%> (-1.98%)	⬇️
...action/scale/autoscale-formula-picker.component.ts	16.45% <0%> (-0.22%)	⬇️

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