Added event to close button

[ataata107]

Fixes #1409 (<=== Replace 0000 with the Issue Number)

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• [X] code is in uniquely-named feature branch and has no merge conflicts
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• [X] Insert-step functionality is working correct as expected.

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[ataata107]

@publiclab/is-reviewers

[codecov[bot]]

Codecov Report

Merging #1412 into main will increase coverage by 10.25%. The diff coverage is 63.77%.

@@             Coverage Diff             @@
##             main    #1412       +/-   ##
===========================================
+ Coverage   55.11%   65.37%   +10.25%     
===========================================
  Files         117      132       +15     
  Lines        2344     2744      +400     
  Branches      360      438       +78     
===========================================
+ Hits         1292     1794      +502     
+ Misses       1052      950      -102     

Impacted Files	Coverage Δ
examples/lib/scopeQuery.js	18.51% <ø> (ø)
src/Modules.js	100.00% <ø> (ø)
src/modules/WebglDistort/Module.js	2.29% <0.00%> (ø)
src/modules/ColorHalftone/Module.js	3.63% <3.63%> (ø)
examples/lib/defaultHtmlStepUi.js	11.35% <4.08%> (-0.85%)	:arrow_down:
examples/lib/intermediateHtmlStepUi.js	11.11% <5.55%> (+0.94%)	:arrow_up:
src/ui/SetInputStep.js	13.84% <11.11%> (-0.44%)	:arrow_down:
examples/lib/insertPreview.js	13.15% <20.00%> (-0.36%)	:arrow_down:
src/util/getImageDimensions.js	20.00% <20.00%> (ø)
src/util/isGif.js	20.00% <20.00%> (ø)
... and 100 more

[ataata107]

@jywarren @keshav234156 can you review this one

[gitpod-io[bot]]