fix(tests): fix test_save_settings_outer_exception in OneDrive coverage tests

The test was patching os.path.join, which is called inside an inner
try/except block in save_onedrive_settings. This meant the exception
was silently caught and logged, never reaching the outer exception
handler that returns HTTP 500.

Fix by patching notify_settings_updated instead, which is called in
the outer try block, so exceptions correctly propagate to the outer
handler.

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

tests/test_api_onedrive_coverage.py

@@ -296,7 +296,7 @@ class TestSaveSettingsException:
 
     def test_save_settings_outer_exception(self, client: TestClient):
         """Trigger the outer exception handler in save_onedrive_settings."""
-        with patch("app.api.onedrive.os.path.join", side_effect=Exception("Unexpected boom")):
+        with patch("app.api.onedrive.notify_settings_updated", side_effect=Exception("Unexpected boom")):
             response = client.post(
                 "/api/onedrive/save-settings",
                 data={