fix: updated notifications preferences url

[awais-ansari]

Description
Updated the notifications preferences section URL which is used on different MFEs to redirect the user to the notifications preferences center.

Old URL: https://account.edx.org/notifications
New URL: https://account.edx.org/#notifications

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (6527f50) to head (155c57b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #389   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          109       109           
  Lines         1085      1085           
  Branches       165       165           
=========================================
  Hits          1085      1085           

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