Allow dla1b to take v0.9 dl1 files as input

[moralejo]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 73.48%. Comparing base (a328e44) to head (d84b83b).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
lstchain/scripts/lstchain_dl1ab.py	50.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1329      +/-   ##
==========================================
- Coverage   73.52%   73.48%   -0.04%     
==========================================
  Files         134      134              
  Lines       14215    14221       +6     
==========================================
  Hits        10451    10451              
- Misses       3764     3770       +6     

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[morcuended]

Looks good to me now (if it is ready for review)