FOM battery automated dispatch lookahead period

[cpaulgilman]

Describe the bug

For front-of-meter (FOM) battery configurations with the automated dispatch option selected on the Battery Dispatch page, the look ahead period appears to be working incorrectly.

To Reproduce

1. Create a Standalone Battery / Merchant Plant case.
2. On the Battery Dispatch page, choose Automated dispatch and change Look ahead period to 12 hours.
3. Run a simulation and note the NPV.
4. Change Look ahead period to 24 hours and repeat.

Note that the NPV is higher for 12-hour look ahead than 24-hour.

See https://sam.nrel.gov/forum/forum-general/5102-reduced-battery-cycling-and-revenue-with-increased-look-ahead-period.html#14376