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 89.86%. Comparing base (01369eb) to head (1b8d621).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1573   +/-   ##
=======================================
  Coverage   89.86%   89.86%           
=======================================
  Files         326      326           
  Lines        5614     5614           
  Branches     1359     1398   +39     
=======================================
  Hits         5045     5045           
  Misses        554      554           
  Partials       15       15           

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