fix: ticket sold out event page restriction

[maze-runnar]

Fixes fossasia/open-event-frontend#5110

Checklist

• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.
• The unit tests 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)

• All the functions created/modified in this PR contain relevant docstrings.

[codecov]

Codecov Report

Merging #7470 (f8a0e52) into development (c5bf371) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #7470   +/-   ##
============================================
  Coverage        66.25%   66.25%           
============================================
  Files              267      267           
  Lines            13233    13233           
============================================
  Hits              8767     8767           
  Misses            4466     4466           

Impacted Files	Coverage Δ
app/api/events.py	52.69% <ø> (ø)

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[iamareebjamal]

Looks good, will test