Fix removeSsvValidator to work with SSV Clusters with ETH payments

[naddison36]

Code Change Checklist

To be completed before internal review begins:

• The contract code is complete
• Executable deployment file
• Fork tests that test after the deployment file runs
• Unit tests *if needed
• The owner has done a full checklist review of the code + tests

Internal review:

• Two approvals by internal reviewers

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.83%. Comparing base (2e58be9) to head (a621825).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2908   +/-   ##
=======================================
  Coverage   50.83%   50.83%           
=======================================
  Files         110      110           
  Lines        4873     4873           
  Branches     1353     1353           
=======================================
  Hits         2477     2477           
  Misses       2392     2392           
  Partials        4        4           

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