don't let rector replace a function with a method in EventResponseSetter

[makomweb]

Replacing a working function with a method does not make sense.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.28%. Comparing base (6feaa0a) to head (0974abf).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #18   +/-   ##
=========================================
  Coverage     52.28%   52.28%           
  Complexity      316      316           
=========================================
  Files            58       58           
  Lines           962      962           
=========================================
  Hits            503      503           
  Misses          459      459           

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