Rename main form

ntfysh_client/Program.cs

@@ -19,7 +19,7 @@ namespace ntfysh_client
             Application.SetHighDpiMode(HighDpiMode.SystemAware);
             Application.EnableVisualStyles();
             Application.SetCompatibleTextRenderingDefault(false);
-            Application.Run(new Form1(NotificationListener));
+            Application.Run(new MainForm(NotificationListener));
         }
     }
 }