Add lower viewcone limit

[maxnoe]

To enable computing IRFs for simulations that have also a lower viewcone limit (e.g. LST ring-wobble MCs), add this missing information here.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03% 🎉

Comparison is base (1164644) 94.78% compared to head (fb8948a) 94.82%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #239      +/-   ##
==========================================
+ Coverage   94.78%   94.82%   +0.03%     
==========================================
  Files          60       60              
  Lines        3050     3073      +23     
==========================================
+ Hits         2891     2914      +23     
  Misses        159      159              

Files Changed	Coverage Δ
pyirf/irf/tests/test_effective_area.py	100.00% <ø> (ø)
pyirf/simulations.py	97.10% <100.00%> (+0.32%)	⬆️
pyirf/tests/test_simulations.py	100.00% <100.00%> (ø)

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