fix: show selected number of sponsor in sponsor-box

[maze-runnar]

Fixes #5712

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 #5739 (f8c28e8) into development (36c936e) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##           development    #5739      +/-   ##
===============================================
- Coverage        23.69%   23.63%   -0.06%     
===============================================
  Files              510      510              
  Lines             5415     5415              
  Branches            59       59              
===============================================
- Hits              1283     1280       -3     
- Misses            4116     4119       +3     
  Partials            16       16              

Impacted Files	Coverage Δ
app/routes/events/view/index.js	0.00% <0.00%> (ø)
app/components/tabbed-navigation.js	33.33% <0.00%> (-20.00%)	⬇️

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