Fixed: save-as not keeping save file location

MainForm.cs

@@ -1184,6 +1184,10 @@ namespace FizzyLauncher
                 Result result = fileHandler.Save(treeView1, filename, password);
                 if (result.IsSuccess)
                 {
+                    this.ApplicationMode = AppMode.Open;
+                    sessionFilename = filename;
+                    sessionPassword = password;
+
                     treeView1.SetNoChanges();
                 }