Save e-learning venues as E-Learning in scraper

[chrisgzf]

Follow up of https://github.com/nusmodifications/nusmods/pull/2736.

This PR changes the scraper to save lesson venues as "E-Learning" when the API returns a room of E-Learn_* for lessons.

To see current shaped of our scraped data: https://nusmods.com/api/v2/2020-2021/modules/CS1010.json

@ZhangYiJiang does this look right to you? Also would need some help to test this, if possible. 😅

Also, don't merge this yet. Still need to add the frontend changes.

[codecov[bot]]

Codecov Report

Merging #2823 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2823   +/-   ##
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  Coverage   46.34%   46.34%           
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  Files         250      250           
  Lines        5302     5302           
  Branches     1220     1220           
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  Hits         2457     2457           
  Misses       2845     2845           

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[nusmods-deploy-bot[bot]]

Deployment preview for b0514b1f ready at http://5f3961bbac0d495396192866--nusmods-deploy-preview.netlify.app