fix: stripe validation condition fix

[maze-runnar]

was showing error even if stripe box is unticked

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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[niranjan94]

Here is an overview of what got changed by this pull request:

Complexity increasing per file
==============================
- app/models/event.js  1
         

See the complete overview on Codacy

[codecov]

Codecov Report

Merging #5292 into development will increase coverage by 0.04%.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##           development    #5292      +/-   ##
===============================================
+ Coverage        22.80%   22.85%   +0.04%     
===============================================
  Files              491      491              
  Lines             5239     5241       +2     
  Branches            37       37              
===============================================
+ Hits              1195     1198       +3     
+ Misses            4039     4038       -1     
  Partials             5        5              

Impacted Files	Coverage Δ
app/models/event.js	50.00% <0.00%> (-7.15%)	⬇️
app/components/tabbed-navigation.js	53.33% <0.00%> (+20.00%)	⬆️

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