Widget Toggle in Mixed Mode

[ZimCodes]

Conditions:

• Mixed Mode
• Multiple Tabs

Bug Reproduction: If you toggle the widget switch, mix mode will deactivate and all tabs will resort to a single theme. Check Video

https://user-images.githubusercontent.com/23222943/136180740-19b6923a-fda3-40aa-98ce-0b778bb2ca06.mp4

.

Originally posted by @ZimCodes in https://github.com/doki-theme/doki-theme-web/issues/72#issuecomment-935885646

[ZimCodes]

This bug was introduced due to the new messaging system implemented in #72.