[Mixpanel Web] - renaming details for alias action

[joe-ayoub-segment]

Minor bug fix for Mixpanel Web Destination. Not in use by customers yet.

Testing

Not needed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 32.57%. Comparing base (34985c3) to head (155b719).

❌ Your project check has failed because the head coverage (32.57%) is below the target coverage (70.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3411       +/-   ##
===========================================
- Coverage   79.84%   32.57%   -47.28%     
===========================================
  Files        1247       14     -1233     
  Lines       23756      703    -23053     
  Branches     4808      119     -4689     
===========================================
- Hits        18969      229    -18740     
+ Misses       3954      474     -3480     
+ Partials      833        0      -833     

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