[Bug]: don't skip rescan when custom folder is not defined

[ThaUnknown]

Preflight checklist

• [X] I have searched the issue tracker for a bug report that matches the one I want to file, without success.
• [X] I have searched the frequently asked questions for a solution that fixes this problem, without success.
• [X] I have checked that I'm using the latest stable version of the app.

What app version are you using?

latest

What operating system version are you using?

Windows

Expected Behavior

skip rescan only skips when file exists

Actual Behavior

if no custom dir is defined and tmp is used, skip rescan shouldnt run, as tmp folder might be cleared by the OS

Screenshots

No response