fix index error left join

[melonora]

follow up from #832 due to unpushed commit fixing the same problem for left join.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.93%. Comparing base (0bed63b) to head (796c001).
Report is 32 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #833   +/-   ##
=======================================
  Coverage   91.93%   91.93%           
=======================================
  Files          47       47           
  Lines        7290     7290           
=======================================
  Hits         6702     6702           
  Misses        588      588           

Files with missing lines	Coverage Δ
src/spatialdata/_core/query/relational_query.py	90.78% <100.00%> (ø)

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