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/citrix-enum-servers-xml.nse

@@ -15,7 +15,7 @@ service.
 -- @output
 -- PORT     STATE SERVICE    REASON
 -- 8080/tcp open  http-proxy syn-ack
--- | citrix-enum-servers-xml:  
+-- | citrix-enum-servers-xml:
 -- |   CITRIX-SRV01
 -- |_  CITRIX-SRV01
 
@@ -29,7 +29,7 @@ license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
 categories = {"discovery", "safe"}
 
 
-portrule = shortport.portnumber({8080,80,443}, "tcp") 
+portrule = shortport.portnumber({8080,80,443}, "tcp")
 
 
 action = function(host, port)
@@ -37,11 +37,11 @@ action = function(host, port)
 	local xmldata = citrixxml.request_server_data(host.ip, port.number)
 	local servers = citrixxml.parse_server_data_response(xmldata)
 	local response = {}
-					
+
 	for _, srv in ipairs(servers) do
 		table.insert(response, srv)
 	end
-	
+
 	return stdnse.format_output(true, response)
 
 end