Update irf_tool_config.json

[moralejo]

Set as standard "efficiency cuts" to a 70% efficiency, which is the "baseline analysis" in the LST1 performance paper.

[moralejo]

Removed superfluous (and confusing) config file for DL3 creation. It must be the same as for IRF creation.
Also:

• Changed default efficiency cuts to 70% efficiency.
• Raised the maximum allowed gammaness cut from 0.95 to 0.98. For very high energies gammaness distribution can be very peaky at 1, and this could be limiting performance.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (24d2e2c) 72.67% compared to head (9e257bf) 72.67%.

Additional details and impacted files

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##             main    #1229   +/-   ##
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  Coverage   72.67%   72.67%           
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  Files         132      132           
  Lines       13655    13655           
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  Hits         9924     9924           
  Misses       3731     3731           

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[morcuended]

Looks good. Maybe the remaining example config file could be named irf_dl3_tool_config.json