Incorrect e_initial value for underground storage

[trevorb1]

Checklist

• I am using the current master branch
• I am running on an up-to-date pypsa-usa environment. Update via conda env update -f envs/environment.yaml

The Issue

The working capacity was accidentally taken to represent e_initial for natural gas underground storage. This is incorrect and can result in situations where e_initial is less than e_min. If you have high enough import capacity, the model can correct this in the first timestep - sometimes masking this problem

Steps To Reproduce

Run a sector model of California, Washington, and Oregon

Expected Behavior

No response

Error Message

No response

Anything else?

No response