Fix systemmonitor preferences being reset
See https://invent.kde.org/frameworks/plasma-framework/-/commit/3078bc25dfe49bb627ae9a65cd18020054a5950e#note_497421 BUG: 454004
See https://invent.kde.org/frameworks/plasma-framework/-/commit/3078bc25dfe49bb627ae9a65cd18020054a5950e#note_497421 BUG: 454004
mentioned in commit e64c1372