Fixes collision export for TARDIS

[andrewfullard]

📝 Description

Type: 🪲 bugfix

Fixes #411 by correctly pointing to the collision preparer.

🚦 Testing

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☑️ Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.68%. Comparing base (3403655) to head (816737f).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #412   +/-   ##
=======================================
  Coverage   66.68%   66.68%           
=======================================
  Files          46       46           
  Lines        3497     3497           
=======================================
  Hits         2332     2332           
  Misses       1165     1165           

Flag	Coverage Δ
	66.68% <ø> (ø)

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