Fix rename window handler to mark action as handled (#9809)

## PR Checklist
* [x] Closes https://github.com/microsoft/terminal/issues/9803
* [x] CLA signed. 
* [ ] Tests added/passed
* [ ] Documentation updated. 
* [ ] Schema updated.
* [ ] I've discussed this with core contributors already.

src/cascadia/TerminalApp/AppActionHandlers.cpp

@@ -719,9 +719,9 @@ namespace winrt::TerminalApp::implementation
                 const auto newName = realArgs.Name();
                 const auto request = winrt::make_self<implementation::RenameWindowRequestedArgs>(newName);
                 _RenameWindowRequestedHandlers(*this, *request);
+                args.Handled(true);
             }
         }
-        args.Handled(false);
     }
 
     void TerminalPage::_HandleOpenWindowRenamer(const IInspectable& /*sender*/,