ModApi.UpdateManager: remove unrequired includes from ProgressDialog.cs

Author: Rosalie241

ModApi.UpdateManager/ProgressDialog.cs

@@ -1,11 +1,5 @@
 using System;
-using System.Collections.Generic;
 using System.ComponentModel;
-using System.Data;
-using System.Drawing;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using System.Windows.Forms;
 
 namespace ModApi.UpdateManager