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/mongodb-databases.nse

@@ -15,7 +15,7 @@ Attempts to get a list of tables from a MongoDB database.
 -- @output
 -- PORT      STATE SERVICE REASON
 -- 27017/tcp open  unknown syn-ack
--- | mongodb-databases:  
+-- | mongodb-databases:
 -- |   ok = 1
 -- |   databases
 -- |     1
@@ -52,18 +52,18 @@ portrule = shortport.port_or_service({27017}, {"mongodb"})
 function action(host,port)
 
 	local socket = nmap.new_socket()
-	
+
 	-- set a reasonable timeout value
 	socket:set_timeout(10000)
 	-- do some exception  / cleanup
 	local catch = function()
 		socket:close()
 	end
-	
+
 	local try = nmap.new_try(catch)
 
 	try( socket:connect(host, port) )
-	
+
 	-- uglyness to allow creds.mongodb to work, as the port is not recognized
 	-- as mongodb, unless a service scan was run
 	local ps = port.service
@@ -76,23 +76,23 @@ function action(host,port)
 		end
 	end
 	port.service = ps
-	
+
 	local req, result, packet, err, status
 	--Build packet
 	status, packet = mongodb.listDbQuery()
 	if not status then return result end-- Error message
-	
+
 	--- Send packet
 	status, result = mongodb.query(socket, packet)
 	if not status then return result end-- Error message
-	
+
 	port.version.name ='mongodb'
 	port.version.product='MongoDB'
 	nmap.set_port_version(host,port)
 
 	local output = mongodb.queryResultToTable(result)
-	if err ~= nil then 
-		stdnse.log_error(err) 
+	if err ~= nil then
+		stdnse.log_error(err)
 	end
 	if result ~= nil then
 		return stdnse.format_output(true, output )