tidy and tweak code

farming.conf_example

@@ -13,7 +13,6 @@ farming.cucumber = true
 farming.corn = true
 farming.coffee = true
 farming.melon = true
-farming.sugar = true
 farming.pumpkin = true
 farming.cocoa = true
 farming.raspberry = true
@@ -30,7 +29,6 @@ farming.pepper = true
 farming.pineapple = true
 farming.peas = true
 farming.beetroot = true
-farming.donuts = true
 
 -- rarety of crops on map, default is 0.001 (higher number = more crops)
 farming.rarety = 0.002