(bug) Fix Select array values showing k (fixes #4560)

[diagramatics]

Issue: #4560

Turns out the assignment of k in a shorthand notation of an object was
wrong. Using k instead of [k]: k makes it assign to parameter key
'k' as opposed to what k as a variable contains.

This is testable with Jest. The added test covers this bug.

[storybook-safe-bot]

	Fails
🚫	PR is not labeled with one of: ["cleanup","BREAKING CHANGE","feature request","bug","documentation","maintenance","dependencies:update","dependencies","other"]

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[codecov]

Codecov Report

Merging #4586 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #4586      +/-   ##
==========================================
+ Coverage   35.57%   35.59%   +0.01%     
==========================================
  Files         557      557              
  Lines        6732     6732              
  Branches      884      884              
==========================================
+ Hits         2395     2396       +1     
+ Misses       3877     3876       -1     
  Partials      460      460

Impacted Files	Coverage Δ
addons/knobs/src/components/types/Select.js	84.61% <100%> (+7.69%)	⬆️

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[ndelangen]

I was planning on fixing this today, thank you so much @diagramatics! 🙇

[ghost]

@diagramatics @ndelangen it still does not work on 4.0.0

[chrisbutler]

would be great to get this into a release!

[Drapegnik]

@chrisbutler, check out #4560 (comment)

[shilman]

@chrisbutler @Drapegnik @danielg2002 missed this. will get out another release today

@ndelangen please tag with patch when you merge if it needs to go out in a release -- helps make sure things get cherry-picked 👍

[Hypnosphi]

weird, this was merged before 4.0 release

[shilman]

@Hypnosphi I released from the release/4.0 branch, which was probably snapshotted just before this got merged into master. My bad for not communicating better.