fix: Ticket sold count query

[iamareebjamal]

Fixes #6693

[codecov]

Codecov Report

Merging #6871 into master will increase coverage by <.01%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master    #6871      +/-   ##
==========================================
+ Coverage   66.21%   66.22%   +<.01%     
==========================================
  Files         307      307              
  Lines       15298    15302       +4     
==========================================
+ Hits        10129    10133       +4     
  Misses       5169     5169

Impacted Files	Coverage Δ
tests/all/integration/api/helpers/test_order.py	98.48% <100%> (+0.09%)	⬆️
app/api/attendees.py	41.17% <50%> (ø)	⬆️

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