[Fixed] 3.72beta - minor typo bug

[rudy]

When attempting to extract fibre from a small number of dried retted flaxes, the message received is "That is too few! You need at least 5 dried retted flaxes to extract practical amount of fibre."

In reality, you get that message for anything less that 15 dried retted flaxes. So the message is probably meant to say that.

[Sami]

This was a real math bug after all, not just a typo.
The fibre plant amount calculation was failing, but the text message referred to correct amount - which can vary depending on the plant.

It's fixed now, and the mininum amount of plants to get "practical amount" ie. one bundle of fibre goes as follows:
5 flaxes
8 hemps
15 nettles

Fixed - persists in 3.72beta, and likely in earlier versions too..