Sorting option highlighted in the image sidebar

[divyabaid16]

Fixes #796 (<=== Add issue number here)

The option by which the user sorts/orders the image is highlighted.

• PR is descriptively titled 📑 and links the original issue above 🔗
• tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR -- or run tests locally with rake test
• code is in uniquely-named feature branch and has no merge conflicts 📁
• screenshots/GIFs are attached 📎 in case of UI updation
• ask @publiclab/mapknitter-reviewers for help, in a comment below

Thanks!

[codeclimate]

Code Climate has analyzed commit 5fd94ce and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Merging #825 into main will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #825   +/-   ##
=======================================
  Coverage   72.43%   72.43%           
=======================================
  Files          35       35           
  Lines        1335     1335           
=======================================
  Hits          967      967           
  Misses        368      368

[jywarren]

Hmm, still needing to resolve #810 -- perhaps @kaustubh-nair could use some help with it? I think it's affecting this here because CodeCov shouldn't be rejecting this!

[kaustubh-nair]

Hmm image_controller coverage is at zero...
Let's try running this again and see what happens

[kaustubh-nair]

Huh that worked..really weird..
@jywarren I believe we should turn off codecov/project since we don't need the entire project's coverage everytime. coverage/patch should be good enough for pull requests.
I've sent a pull here #830

[jywarren]

OK, cool, well, I merged this in any case!