[spec] Add ToggleSwitch spec stub (#5450)
[spec] Add ToggleSwitch spec stub (#5450)

To protect against issues like #5448.
mihailim/koreader,Frenzie/koreader,koreader/koreader,Frenzie/koreader,Markismus/koreader,poire-z/koreader,NiLuJe/koreader,mwoz123/koreader,koreader/koreader,Hzj-jie/koreader,NiLuJe/koreader,pazos/koreader,poire-z/koreader