Better warning message in R0 to R0G

[moralejo]

The previous message suggested an action which is not actually needed in most cases.

[codecov]

Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 73.49%. Comparing base (378a4c3) to head (ed795b1).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
lstchain/scripts/lstchain_r0_to_r0g.py	37.50%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1285      +/-   ##
==========================================
- Coverage   73.49%   73.49%   -0.01%     
==========================================
  Files         134      134              
  Lines       14207    14210       +3     
==========================================
+ Hits        10442    10443       +1     
- Misses       3765     3767       +2     

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