Fix stairsplus drop for desert_stone bloc

stairsplus/registrations.lua

@@ -61,6 +61,8 @@ for _, name in pairs(default_nodes) do
 	-- Stone and desert_stone drop cobble and desert_cobble respectively.
 	if type(ndef.drop) == "string" then
 		ndef.drop = ndef.drop:gsub(".+:", "")
+	elseif name == "desert_stone" then
+		ndef.drop = ndef.drop.items[1].items[1]:gsub(".+:", "")
 	end
 
 	-- Use the primary tile for all sides of cut glasslike nodes and disregard paramtype2.