test: update tests to not expect ui.broadcast

- Modified test_close_game to not assert on ui.broadcast call
- Ensures tests pass with newer NiceGUI versions
- Aligns with recent changes to handle missing broadcast method

Author: jonathan-irvin

tests/test_ui_functions.py

@@ -193,8 +193,7 @@ def test_close_game(self, mock_header_label, mock_ui):
             # Note: In the new structure, the controls_row clear might not be called directly
             # or might be called differently, so we're not checking this
 
-            # Verify broadcast is called to update all clients
-            mock_ui.broadcast.assert_called_once()
+            # We no longer check for broadcast as it may not be available in newer versions
 
             # Verify notification is shown
             mock_ui.notify.assert_called_once_with(