Moved lastExecuted update to TaskExecutor.Execute

Tranga/TaskExecutor.cs

@@ -7,6 +7,7 @@ public static class TaskExecutor
         Connector? connector = connectors.FirstOrDefault(c => c.name == trangaTask.connectorName);
         if (connector is null)
             throw new ArgumentException($"Connector {trangaTask.connectorName} is not a known connector.");
+        trangaTask.lastExecuted = DateTime.Now;
         
         switch (trangaTask.task)
         {

Tranga/TaskManager.cs

@@ -29,7 +29,6 @@ public class TaskManager
             {
                 if(task.ShouldExecute()) 
                     TaskExecutor.Execute(this.connectors, task, this._chapterCollection);
-                task.lastExecuted = DateTime.Now;
             }
             Thread.Sleep(1000);
         }