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/snmp-win32-users.nse

@@ -10,7 +10,7 @@ Attempts to enumerate Windows user accounts through SNMP
 
 ---
 -- @output
--- | snmp-win32-users:  
+-- | snmp-win32-users:
 -- |   Administrator
 -- |   Guest
 -- |   IUSR_EDUSRV011
@@ -46,38 +46,38 @@ function process_answer( tbl )
 	for _, v in ipairs( tbl ) do
 		table.insert( new_tab, v.value )
 	end
-	
+
 	table.sort( new_tab )
-	
+
 	return new_tab
-	
+
 end
 
 action = function(host, port)
 
 	local socket = nmap.new_socket()
 	local catch = function() socket:close()	end
-	local try = nmap.new_try(catch)	
+	local try = nmap.new_try(catch)
 	local snmpoid = "1.3.6.1.4.1.77.1.2.25"
 	local users = {}
 	local status
 
 	socket:set_timeout(5000)
 	try(socket:connect(host, port))
-	
+
 	status, users = snmp.snmpWalk( socket, snmpoid )
 	socket:close()
 
 	if( not(status) ) then
 		return
 	end
-	
+
 	users = process_answer( users )
 
 	if ( users == nil ) or ( #users == 0 ) then
 		return
 	end
-	
+
 	nmap.set_port_state(host, port, "open")
 
 	return stdnse.format_output( true, users )