fixing bug qsvt

[KetpuntoG]

Fixes https://github.com/PennyLaneAI/pennylane/issues/6104

[sc-71442]

[github-actions[bot]]

Hello. You may have forgotten to update the changelog! Please edit doc/releases/changelog-dev.md with:

• A one-to-two sentence description of the change. You may include a small working example for new features.
• A link back to this PR.
• Your name (or GitHub username) in the contributors section.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.65%. Comparing base (3543cef) to head (6cafe0a). Report is 312 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #6105 +/- ## ========================================== - Coverage 99.66% 99.65% -0.01% ========================================== Files 432 432 Lines 41988 41691 -297 ========================================== - Hits 41847 41549 -298 - Misses 141 142 +1 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.