Updated chatlog mods : invalid commands are hidden

- From now on, invalid commands are hidden when launched, like in
  realchat.
NOTE: The update have been checked with git diff : no differencies, the
mod have never been changed by us.

mods/chatplus/init.lua

@@ -135,7 +135,11 @@ function chatplus.register_handler(func,place)
 	end
 end
 
-function chatplus.send(from,msg)
+function chatplus.send(from, msg)
+	if msg:sub(1, 1) == "/" then
+		return false
+	end
+
 	-- Log chat message
 	if chatplus.log_handle ~= nil then
 		chatplus.log_handle:write(