fix: show refund policy button only if its present

[snitin315]

Refers #5036

Related API PR-> fossasia/open-event-server#7254

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[codecov]

Codecov Report

Merging #5039 into development will decrease coverage by 0.05%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development    #5039      +/-   ##
===============================================
- Coverage        22.74%   22.68%   -0.06%     
===============================================
  Files              488      488              
  Lines             5183     5183              
  Branches            21       21              
===============================================
- Hits              1179     1176       -3     
- Misses            4000     4003       +3     
  Partials             4        4              

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

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