Fix failing E-scaling test

[moralejo]

This test failed with 3.11 (may be an occasional fail), attempt to fix it.

[morcuended]

@moralejo see #1300

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 73.51%. Comparing base (ddcf4f9) to head (d7193a1).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
lstchain/tools/tests/test_tools.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1307      +/-   ##
==========================================
- Coverage   73.51%   73.51%   -0.01%     
==========================================
  Files         134      134              
  Lines       14218    14217       -1     
==========================================
- Hits        10453    10451       -2     
- Misses       3765     3766       +1     

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[moralejo]

@moralejo see #1300

Damn, actually I vaguely remembered there was something pending related to this scaling...

[moralejo]

Merged #1300 instead