[fix] Try to make screensaver settings slightly less error-prone (#5460)
[fix] Try to make screensaver settings slightly less error-prone (#5460)

Regression inadvertently caused by #5369.

With the way this is constructed, this is almost guaranteed to happen.

Fixes #5459.
mihailim/koreader,Frenzie/koreader,poire-z/koreader,Markismus/koreader,Frenzie/koreader,mwoz123/koreader,koreader/koreader,Hzj-jie/koreader,koreader/koreader,pazos/koreader,NiLuJe/koreader,poire-z/koreader,NiLuJe/koreader