fix: removing edX text reference on video fallback message

[jacobo-dominguez-wgu]

Description

Updating video fallback message to remove edX reference.

Supporting information

#1015
openedx/wg-build-test-release#491

Testing instructions

On studio dashboard enter to a course
Click to edit or create a unit
Add a new component video type
On the video modal scroll down to fallback video section and verify the text.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.93%. Comparing base (88aa4c1) to head (c863c01).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1996      +/-   ##
==========================================
+ Coverage   93.90%   93.93%   +0.03%     
==========================================
  Files        1153     1154       +1     
  Lines       24053    24073      +20     
  Branches     5198     5094     -104     
==========================================
+ Hits        22586    22614      +28     
+ Misses       1399     1391       -8     
  Partials       68       68              

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