DM-47947: fix consistency bug in aggregate spatial overlap postprocessing

[TallJimbo]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes
• (if changing dimensions.yaml) make a copy of dimensions.yaml in configs/old_dimensions

[codecov]

Codecov Report

Attention: Patch coverage is 97.29730% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.49%. Comparing base (8636101) to head (7c75861).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...t/daf/butler/direct_query_driver/_query_builder.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1131      +/-   ##
==========================================
- Coverage   89.49%   89.49%   -0.01%     
==========================================
  Files         366      366              
  Lines       48805    48832      +27     
  Branches     5900     5906       +6     
==========================================
+ Hits        43680    43703      +23     
- Misses       3718     3720       +2     
- Partials     1407     1409       +2     

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[andy-slac]

Looks great.