[16.25] [Mods] Accumulator drain does not function correctly

[Hexicube]

When adding drain to accumulators via a mod, it is added to the accumulator but does not always drain power. It appears to only drain power when not connected to a network.

A bare-bones mod is attached for reproducing the problem. The only thing it does is give accumulators 5kW drain.

Steps to reproduce, with mod installed:

- Create a simple power network consisting of 1 power pole, 1 accumulator, and 1 solar panel
- Remove the solar panel, leaving a partially (or fully) charged accumulator; note the lack of idle drain
- Remove the power pole; note that power is now draining, as indicated by the hover UI
- Re-add the power pole; note that power has stopped draining

[Rseding91]

Thanks for the report. Due to how accumulators work in batched form I'm going to say we don't support the drain property on accumulators and that we won't fix this.