Mensuration demo fixed

[robot-ci-heartex]

Hi @matt-bernstein!

This PR was created in a response to PRs in upstream repos:

• fix: DIA-1144: Mensuration demo fixed label-studio-sdk#253

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.78%. Comparing base (ff6d2ac) to head (ffb787a).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #6017   +/-   ##
========================================
  Coverage    76.77%   76.78%           
========================================
  Files          168      168           
  Lines        13605    13605           
========================================
+ Hits         10445    10446    +1     
+ Misses        3160     3159    -1     

Flag	Coverage Δ
pytests	76.78% <ø> (+<0.01%)	⬆️

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