Brine should be able to water waterleafs

[mitboy]

Currently WaterLeafs only accept salt water but do not grow from  Brine, which means for a sustainable Waterleaf farms you need a salt water geyser, while Salt Slush geysers do not work. 

There are map generations where you may not get a salt water geyser, which only leaves space POIs as small source of Salt water, as you are unable to make it yourself. 

The solution would be to make Brine as an acceptable food for waterleafs, or we should be able to  partially desalinate brine/create salt water.