fix: error handling for IDX actions

[aarongranick-okta]

Fixes a bug in error handling for IDX actions.
"remediators" was being passed to the handler instead of "remediator".
Tests for remediate.ts are coming in a follow-up PR

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 92.49%. Comparing base (71c3352) to head (4295de6).
Report is 2 commits behind head on 6.3.

Files with missing lines	Patch %	Lines
lib/idx/remediate.ts	60.00%	2 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##              6.3    #1160   +/-   ##
=======================================
  Coverage   92.49%   92.49%           
=======================================
  Files         159      159           
  Lines        4477     4477           
  Branches      992      992           
=======================================
  Hits         4141     4141           
  Misses        316      316           
  Partials       20       20           

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