fix: Use checkbox for adding new proposal in create speaker form

[Haider8]

Fixes #4027

Short description of what this resolves:

In create speaker form we can't check and uncheck add a new proposal

Changes proposed in this pull request:

Use checkbox for add new proposal

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)

[codecov]

Codecov Report

Merging #4571 into development will increase coverage by 0.06%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development    #4571      +/-   ##
===============================================
+ Coverage        22.21%   22.28%   +0.06%     
===============================================
  Files              473      473              
  Lines             4975     4973       -2     
  Branches             8        8              
===============================================
+ Hits              1105     1108       +3     
+ Misses            3869     3864       -5     
  Partials             1        1              

Impacted Files	Coverage Δ
app/components/forms/session-speaker-form.js	0.00% <ø> (ø)
app/components/tabbed-navigation.js	53.33% <0.00%> (+20.00%)	⬆️

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[Haider8]

@iamareebjamal Please review

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[mariobehling]

This is actually illogical. I missed the point where this was changed to a working earlier version.

A random speaker who signs up on the platform should not be able to add him or herself to an existing session proposal. This should only be possible if a speaker gets an invitation to an existing proposal by an existing speaker.

Therefore this needs to be changed. The slider needs to be taken out and the "add proposal area" should always show up.

[mariobehling]

Ok, now I understand. This is only for organizers. It seems to work. However, if I create a session and then unslide it, it will already create an empty session and stores it in the system.

[mariobehling]

I added an issue to follow up here #4575
Thank you!