Add lipid17_merged.xml to default FF settings

[IAlibay]

In OpenFreeEnergy/openfe#1561 we found that we had to add lipid17 to all the adaptive settings. @jthorton brought up the idea of just adding it to our default FF list since it shouldn't clash other FFs being defined.

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[IAlibay]

pre-commit.ci autofix

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.89%. Comparing base (edb0d37) to head (9e871e1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #767   +/-   ##
=======================================
  Coverage   98.89%   98.89%           
=======================================
  Files          43       43           
  Lines        2705     2705           
=======================================
  Hits         2675     2675           
  Misses         30       30           

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[github-actions]

No API break detected ✅