Fix logic error in nvidia frequency calculation

[w0j0pl]

Made a suggested change in logic from issue #1177

Checklist

• [x] I have described the changes
• [x] I have linked to any relevant GitHub issues, if applicable
• [ ] Documentation in doc/ has been updated
• [x] All new code is licensed under GPLv3

Description

• Describe the changes, why they were necessary, etc
• Describe how the changes will affect existing behaviour.
• Describe how you tested and validated your changes.
• Include any relevant screenshots/evidence demonstrating that the changes work and have been tested.

[netlify[bot]]

✅ Deploy Preview for conkyweb canceled.

Name	Link
🔨 Latest commit	b0a5f6aead2ab2c5d2ac6b477b11afdebce98ad2
🔍 Latest deploy log	https://app.netlify.com/sites/conkyweb/deploys/66cb29209dce5d000805f17d