fix: Update course preference notification key for ORA new submission

[hassan-raza-1]

What changed?
In this PR we have updated the course notification preference key for ORA new submissions , As we have updated the key on backend

Ticket
https://2u-internal.atlassian.net/browse/INF-1838

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.29%. Comparing base (9b02c95) to head (2eb1deb).
Report is 13 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2286   +/-   ##
=======================================
  Coverage   95.29%   95.29%           
=======================================
  Files         195      195           
  Lines       21626    21626           
  Branches     1502     1502           
=======================================
  Hits        20608    20608           
  Misses        771      771           
  Partials      247      247           

Flag	Coverage Δ
unittests	95.29% <100.00%> (ø)

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