cleanup: remove a TODO that has been take care of

[easwars]

This was taken care of in #7653

RELEASE NOTES: none

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.90%. Comparing base (d7f27c4) to head (3d72ce1).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7855      +/-   ##
==========================================
+ Coverage   81.88%   81.90%   +0.01%     
==========================================
  Files         374      374              
  Lines       37993    37993              
==========================================
+ Hits        31110    31117       +7     
+ Misses       5586     5581       -5     
+ Partials     1297     1295       -2     

Files with missing lines	Coverage Δ
rpc_util.go	79.48% <ø> (ø)

... and 16 files with indirect coverage changes

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