SMES UI fixes

- SMES now shows "Partially Charging" in UI when it has at least some input, but not enough to charge at set rate.
- Added yellowish-orange overlay which is used instead of the normal one if the SMES is partially charging, so you can visually see it without having to open the UI.
- UI input/output rate fields are now 20px wider. This fixes issues with values that exceed 1 000 000 W. Such values are possible with multi-coiled SMESs.