Bug report: correctly set battery O&M costs

[kbrunik]

Correctly setting O&M costs in the Custom Financial Model

O&M costs for the battery are not being set correctly for the custom financial model. @elenya-grant commented out battery specific ways of setting O&M in PR #346. The issue is that doing so cause the SingleOwner module to not work correct. I think we need to make updates to the CustomFinancialModel to make sure it's updating properly rather than deleting these if statements. test_hybrid.py::test_hybrid_om_costs is failing and that means that if we pull in this change that you won't be able to use SingleOwner.

How to reproduce

Relevant output