reduce intllib code

extranodes/init.lua

@@ -1,12 +1,7 @@
 -- Minetest 0.4.6 mod: extranodes
 -- namespace: technic
 -- Boilerplate to support localized strings if intllib mod is installed.
-local S
-if rawget(_G, "intllib") then
-	S = intllib.Getter()
-else
-	S = function(s) return s end
-end
+local S = rawget(_G, "intllib") and intllib.Getter() or function(s) return s end
 
 -- register stairsplus/circular_saw nodes
 -- we skip blast resistant concrete and uranium intentionally