[Bug] Crop Whitespace still active when switching to the Webtoon reader

When switching from any of the other readers with Crop Whitespace active, it still remains active, without an option to turn it off in the Webtoon reader's Settings menu.

Crop Whitespace can still be useful when using the Webtoon reader, so adding an option to turn it on/off in the settings like for the other readers would be nice.