support farming_plus plants.

init.lua

@@ -31,7 +31,8 @@ digtron.builder_on_place_items = {
 
 -- Then a string prefix is checked, returning this value. Useful for enabling on_placed on a mod-wide basis.
 digtron.builder_on_place_prefixes = {
-	["farming:"] = true, 
+	["farming:"] = true,
+	["farming_plus:"] = true,
 	["crops:"] = true, 
 }
 

util_item_place_node.lua

@@ -77,7 +77,7 @@ end
 
 digtron.item_place_node = function(itemstack, placer, place_to, param2)
 	local def = itemstack:get_definition()
-	if not def or def.type ~= "node" then
+	if not def then
 		return itemstack, false
 	end