webhooks sent on exatorrent startup

[Sidefix]

Hello!

Testing version 0.12 using webhooks to perform actions on torrent completions.
The feature works as intended in most scenarios, however a reboot of exatorrent will trigger a re-sending of webhooks for already-completed torrents.

This can cause a duplication of webhook requests which, depending on what you are doing you can imagine how it can become extremely problematic.

I currently have workarounds in place to mitigate this, but it would be useful to have a configuration for exatorrent to prevent sending webhook requests on startup.

If such a setting already exists or if I'm missing something, my apologies. I've combed through the docs and couldn't find anything useful on this.

Thank you in advance.

[varbhat]

New Field in DB Table must be added to fix this :(

Or new table must be created. I will look into it.