Appearance settings lost after browser cache clear

⚠️ Please verify that this bug has NOT been raised before.

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Description

Changed settings for

• Language
• Theme

are not saved after a browser cache clear.

👟 Reproduction steps

1. Login into Uptime Kuma
2. Go to /settings/appearance
3. Change language
4. Change theme to dark
5. Logout
6. Clear browser cache / Open a private surfing window
7. Re login
8. theme is changed back to Auto / Language is changed back to English

👀 Expected behavior

This settings should be saved into the database.

😓 Actual Behavior

Appearance settings lost after browser cache clear.

🐻 Uptime-Kuma Version

1.17.1

💻 Operating System and Arch

Debian

🌐 Browser

Firefox 91.10.0esr

🐋 Docker Version

20.10.17

🟩 NodeJS Version

_No response_

📝 Relevant log output

_No response_