Fix #336 by correctly setting arrow-param

[danez]

Q	A
Bug fix?	yes
Breaking change?	no
New feature?	no
Deprecations?	no
Spec compliancy?	no
Tests added/pass?	yes
Fixed tickets	Fixes #336
License	MIT

The param refNeedsArrowPos of parseMaybeAssign() wasn't populated in the failing case.

Tbh this params (refShorthandDefaultPos, refNeedsArrowPos) are very magic to me and it takes a while to see what they do. When I have time again I will try to remove them and instead try to use the state for this with speaking names, but I'm not sure if that is possible.

[codecov-io]

Codecov Report

Merging #337 into master will not impact coverage.

@@           Coverage Diff           @@
##           master     #337   +/-   ##
=======================================
  Coverage   97.65%   97.65%           
=======================================
  Files          20       20           
  Lines        3326     3326           
  Branches      882      882           
=======================================
  Hits         3248     3248           
  Misses         30       30           
  Partials       48       48

Impacted Files	Coverage Δ
src/parser/expression.js	97.32% <100%> (ø)	✅
src/plugins/flow.js	97.52% <100%> (ø)	✅

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