Update add_hls_video_to_edx

[collinpreston]

Pre-Flight checklist

• [x] Testing
  • [x] Changes have been manually tested

What's this PR do?

Update the HLS video command to call post_video_to_edx instead of post_hls_to_edx which does not exist anymore.

How should this be manually tested?

1. Have OVS running and configured.
2. Add a video to OVS in a collection that is associated with an edx course.
3. Run docker-compose run web python ./manage.py add_hls_video_to_edx --edx-course-id <COURSE_ID>
4. Verify that the video is configured in edx as part of the course's assets: http://localhost:18010/assets//

[codecov-commenter]

Codecov Report

Merging #1020 (8c1e6a9) into master (8de7b30) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1020   +/-   ##
=======================================
  Coverage   95.98%   95.98%           
=======================================
  Files         182      182           
  Lines        7356     7356           
  Branches      254      254           
=======================================
  Hits         7061     7061           
  Misses        261      261           
  Partials       34       34           

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