Removed electron drift electrons starting at z > -1 cm

[sebvetter]

What does the code in this PR do / what does it improve?

The default field distortion map only extends up to z = -1 cm, afterwards it extrapolates. Electrons at the very top of the TPC do not drift and need to field distortion. Therefore I removed the application of the FDC for z > -1 cm.

Can you briefly describe how it works?

Make a selection of events with z < -1cm and apply the field distortion on the selected events (instead of all).

Can you give a minimal working example (or illustrate with a figure)?

Before the fix: The position in the instructions and the position at the interface are not the same because of electron drift.

After the fix: The instructed position and the interface position are the same (only electrons starting at z = -0.1cm shown).

Please include the following if applicable:

• Update the docstring(s)
• Bump plugin version(s)
• Update the documentation
• Tests to check the (new) code is working as desired.
• Does it solve one of the GitHub open issues?

[coveralls]

Pull Request Test Coverage Report for Build 13653280447

Details

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 79.981%

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Totals
Change from base Build 13387532307:	0.02%
Covered Lines:	2537
Relevant Lines:	3172

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💛 - Coveralls