fix(fxFlex): apply correct flex-basis stylings

[CaerusKaru]

• Fix for when flex-basis is unitless and 0
• Fix for when no width/height is applied and flex-basis should be
  set
• Fix for IE flex-basis with calc values
• Fix for SSR properties set to 0

Fixes #277
Fixes #280
Fixes #323
Fixes #528
Fixes #534

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