[Rseding91] [0.13.13] rebuild furnace by bots keep their fuel value

[LotA]

Its not the items in the fuel slot but the "red bar" that keeps its value from the destroyed entity when it should be reset
I guess the same behavior is expectable from any entity with a fuel slot (boilers, burner inserters...) but haven"t tested.

To reproduce :
place a furnace
fuel it
smelt something so the red bar appear
shoot the furnace down
let a bot rebuild it
the red bar is back to where it was when the entity was destroyed

[Rseding91]

Fixed for 0.13.14.