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/gopher-ls.nse

@@ -60,7 +60,7 @@ action = function( host, port )
 	if not status then
 		return
 	end
-	
+
 	socket:send("\r\n")
 
 	local buffer, _ = stdnse.make_buffer(socket, "\r\n")