events: remove redundant todo

[gurgunday]

As said by the person who put the todo in the first place, it has been redundant for a while now

We have kWeakHandler: this now

PR removes it to prevent confusion

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.54%. Comparing base (b4b1413) to head (3673174).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #60595      +/-   ##
==========================================
- Coverage   88.56%   88.54%   -0.03%     
==========================================
  Files         704      704              
  Lines      208077   208075       -2     
  Branches    40084    40077       -7     
==========================================
- Hits       184289   184233      -56     
- Misses      15826    15882      +56     
+ Partials     7962     7960       -2     

Files with missing lines	Coverage Δ
lib/internal/event_target.js	99.16% <ø> (-0.01%)	⬇️

... and 48 files with indirect coverage changes

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