Remove outdated hacks to make evt.modules.spms work with older data production versions

[gipert]

@ggmarshall this needs testing.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 48.63%. Comparing base (d53c613) to head (9185cfe).
Report is 2 commits behind head on main.

Files	Patch %	Lines
src/pygama/evt/modules/larveto.py	0.00%	2 Missing ⚠️
src/pygama/evt/modules/spms.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #580      +/-   ##
==========================================
- Coverage   50.07%   48.63%   -1.44%     
==========================================
  Files          59       59              
  Lines        7755     7750       -5     
==========================================
- Hits         3883     3769     -114     
- Misses       3872     3981     +109     

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