Update non-specific geometry configuration xml files to mirror craterlake

[simonge]

Steps to reproduce: (give a step by step account of how to trigger the bug)

1. Run a simulation with e.g. 18x275.xml

Expected Result: (what do you expect when you execute the steps above)

Result the same as the current craterlake configuration used in CI runs

Actual Result: (what do you get when you execute the steps above)

Uses the brycecanyon configuration