Remove trailing whitespace in lua files

Whitespace is not significant, so this should not be a problem.
https://secwiki.org/w/Nmap/Code_Standards

scripts/cups-queue-info.nse

@@ -9,12 +9,12 @@ printer.
 
 ---
 -- @usage
--- nmap -p 631 <ip> --script cups-queue-info 
+-- nmap -p 631 <ip> --script cups-queue-info
 --
 -- @output
 -- PORT    STATE SERVICE
 -- 631/tcp open  ipp
--- | cups-queue-info: 
+-- | cups-queue-info:
 -- |   HP Laserjet
 -- |     id  time                 state  size (kb)  owner            jobname
 -- |     14  2012-04-26 22:01:19  Held   2071k      Patrik Karlsson  Print - CUPS Implementation of IPP - Documentation - CUPS
@@ -41,7 +41,7 @@ action = function(host, port)
 	if ( not(helper:connect()) ) then
 		return fail("Failed to connect to server")
 	end
-	
+
 	local output = helper:getQueueInfo()
 	if ( output ) then
 		return stdnse.format_output(true, output)