fix: Change default pre-selected fields in wizard step 4

[Haider8]

Fixes #4586

Short description of what this resolves:

Session and speaker custom forms have few fields pre-selected for new events in wizard step 4.

Changes proposed in this pull request:

Change default pre-selected fields

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 #4603 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #4603   +/-   ##
============================================
  Coverage        22.27%   22.27%           
============================================
  Files              474      474           
  Lines             4988     4988           
  Branches             8        8           
============================================
  Hits              1111     1111           
  Misses            3876     3876           
  Partials             1        1           

Impacted Files	Coverage Δ
app/mixins/custom-form.js	0.00% <ø> (ø)

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[iamareebjamal]

Track optional is not implemented on server yet. Revert to previous state