Revert fetch-wbw back to mirror-box again once the mirror-box is updated

[zainfathoni]

@zainfathoni the netlify build will always fail since I added a new static property slug when generating data with etc/fetchers. The new format isn't generated when netlify executes yarn build which will cause provinceSlug to be undefined thus causing next build to throw errors (as it expects the slug to be at least null or empty string).

Can we make sure that the app fetches fresh data before any build?

You can temporarily revert this line into using the fetch-wbw script again, so that we can merge this PR to the main branch.
Once it has been merged to the main branch, the mirror-box script gets the latest version of your fetch-wbw.js implementation after a few minutes. After that, you can raise another PR to revert your changes to use the mirror-box again. 😅

I know it's a hassle, but I don't think we need to optimize this workflow, because #374 is coming soon anyway, and it will render both fetch-wbw and mirror-box useless. 😅

Originally posted by @zainfathoni in #361 (comment)

[zainfathoni]

Reopening this issue due to #469