Fix luacheck errors

.luacheckrc

@@ -23,5 +23,6 @@ read_globals = {
 	"mcl_sounds",
 	"pipeworks",
 	"screwdriver",
-	"intllib"
+	"intllib",
+	"digilines"
 }

lua/controller.lua

@@ -333,7 +333,7 @@ local function controller_node_timer(pos, elapsed)
 		return true
 	end
 
-	drawers_table_index = controller_get_drawer_index(pos, src_name)
+	local drawers_table_index = controller_get_drawer_index(pos, src_name)
 
 	-- This might not be needed, but my concern is if the above indexing takes
 	-- enough time, there could be a "race condition" where the item in the src