Revert change of timestamp format

Reverting the change of format of the timestamp that gets saved into episode_action table.
Reason: The 'T' was in there so that the timestamp format is like AntennaPod's timestamp format.

lib/Controller/EpisodeActionController.php

@@ -112,6 +112,6 @@ class EpisodeActionController extends Controller {
 	{
 		return \DateTime::createFromFormat('D F d H:i:s T Y', $timestamp)
 			->setTimezone(new DateTimeZone('UTC'))
-			->format("Y-m-d H:i:s");
+			->format("Y-m-d\TH:i:s");
 	}
 }