fix: Use selected for attendee order-form dropdowns

[Haider8]

Fixes #4619

Short description of what this resolves:

Attendee order-form dropdowns for gender, country and ageGroup needs to be double clicked in order to select it which is wrong.

Changes proposed in this pull request:

Use selected in order to select that particular option

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.
• The acceptance, integration, unit tests and linter pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

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[codecov]

Codecov Report

Merging #4654 into development will increase coverage by 0.02%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development    #4654      +/-   ##
===============================================
+ Coverage        23.05%   23.08%   +0.02%     
===============================================
  Files              475      475              
  Lines             4957     4952       -5     
  Branches             8        8              
===============================================
  Hits              1143     1143              
+ Misses            3813     3808       -5     
  Partials             1        1              

Impacted Files	Coverage Δ
app/controllers/events/view.js	0.00% <0.00%> (ø)
app/components/public/call-for-speakers.js	0.00% <0.00%> (ø)
app/components/modals/publish-unpublish-modal.js
app/components/modals/cfs-proposal-modal.js	0.00% <0.00%> (ø)

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[iamareebjamal]

Try using just value and remove onChange. Not sure why both were used. Using selected and onChange with duplicate code, when there is value, seems wrong

[Haider8]

Try using just value and remove onChange

@iamareebjamal Not working too!

[iamareebjamal]

OK