Make flattenSubscription hooks-safe

[Andarist]

The simplest thing I could think of that would make flattenSubscription hooks-safe.

[codecov]

Codecov Report

Merging #479 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #479   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          15     15           
  Lines         233    235    +2     
  Branches       62     58    -4     
=====================================
+ Hits          233    235    +2

Impacted Files	Coverage Δ
src/ReactFinalForm.js	100% <100%> (ø)	⬆️
src/useFormState.js	100% <100%> (ø)	⬆️
src/useField.js	100% <100%> (ø)	⬆️
src/flattenSubscription.js	100% <100%> (ø)	⬆️

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[erikras]

OOHHHH!!! The || was what you meant by not being "hooks safe". 🤦‍♂️

[Andarist]

Not rly :p this was just a small stylistic~ change.

I meant this https://github.com/facebook/react/blob/d34b457ce2a2cee1160dbc90b93312ff9850958c/packages/react-reconciler/src/ReactFiberHooks.js#L315 .

[erikras]

Published in v5.1.1.

[lock]

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