Operational Reserve is not compatiable with sector studies

[trevorb1]

Version Checks (indicate both or one)

• [x] This bug exists on the master branch of PyPSA-USA.

• [x] This bug exists on the develop branch of PyPSA-USA.

The Issue

The operational reserve only indexes over generators, not links which numerous generators are converted to in sector studies. Moreover, the demand is wrong as it is grabbing all end-use carriers.

Steps To Reproduce

No response

Error Message

Anything else?

No response